Did You Hear the One About the Doctor? An Examination of Doctor Jokes Posted on Facebook
Background: Social networking sites such as Facebook have become immensely popular in recent years and present a unique opportunity for researchers to eavesdrop on the collective conversation of current societal issues.
Objective: We sought to explore doctor-related humor by examining doctor jokes posted on Facebook.
Methods: We performed a cross-sectional study of 33,326 monitored Facebook users, 263 (0.79%) of whom posted a joke that referenced doctors on their Facebook wall during a 6-month observation period (December 15, 2010 to June 16, 2011). We compared characteristics of so-called jokers to nonjokers and identified the characteristics of jokes that predicted joke success measured by having elicited at least one electronic laugh (eg, an LOL or “laughing out loud”) as well as the total number of Facebook “likes” the joke received.
Results: Jokers told 156 unique doctor jokes and were the same age as nonjokers but had larger social networks (median Facebook friends 227 vs 132, P<.001) and were more likely to be divorced, separated, or widowed (P<.01). In 39.7% (62/156) of unique jokes, the joke was at the expense of doctors. Jokes at the expense of doctors compared to jokes not at the expense of doctors tended to be more successful in eliciting an electronic laugh (46.5% vs 37.3%), although the association was statistically insignificant. In our adjusted models, jokes that were based on current events received considerably more Facebook likes (rate ratio [RR] 2.36, 95% CI 0.97-5.74).
Conclusions: This study provides insight into the use of social networking sites for research pertaining to health and medicine, including the world of doctor-related humor.
J Med Internet Res 2014;16(2):e41)
Laughter is the best medicine, as the saying goes. Sociologists identify humor as a social phenomenon embedded in interaction  that can affirm conventional views about the world [ ], highlight status differences within or outside of a group [ , ], enhance social bonds [ , ], or relieve stress [ , ]. It may be the latter effect that underlies the saying about laughter as medicine, but joking about medical care or practitioners may have other implications. Scholars have worried about the declining status and authority of physicians for the past 3 decades or more [ - ]. Although doctor jokes have been around since ancient times (eg, McDonald [ ]), joking about doctors may contribute to this decline. Other evidence suggests declining career satisfaction among physicians [ , ] as a possible result of this declining status.
Although it may be difficult to know if doctors think doctor jokes are funny, we do know that generally people tell jokes with the intention of amusing others  and this may be accompanied by a complex range of motivations, from the expression of disagreement or dissatisfaction to an indication of endearment and friendship [ ]. Freud argued that humor was a socially acceptable form of aggression in modern life, particularly when directed toward high status or powerful others [ ]. Research suggests that people use and appreciate humor when the target of the joke is from a group different than their own [ , ], which may both enhance cohesion within a group [ ] and relieve tension or stress [ ] producing the stated “medicinal” effect of laughter. Given the relatively high status of physicians in society, it makes sense they would be the target of jokes. In addition, because Americans are generally dissatisfied with their health care system [ ], joking about doctors and medicine may provide a socially acceptable way to express that dissatisfaction. Joking about medicine is also likely to be an important coping mechanism for patients facing serious illness [ ].
Other evidence suggests that higher status group members or those who aspire to higher status are more likely to engage in joking behavior, particularly in status-differentiated groups . In addition, there is a relationship between whether the joker himself laughs first, the number of “audience” members, and how much others laugh at the joke [ ]. According to Glenn [ ], in groups of 2 or larger it is not typical for the joker to laugh first (unlike in dyads).
Although we seem to know more than one might think about joking and jokers, there is relatively little research on humor in spontaneous conversation [- ]. This is likely because of the difficulty in capturing spontaneous conversations for analysis. Today, however, a great deal of social interaction occurs online in social networking sites, such as Facebook. Currently Facebook has 874 million active users worldwide, communicating in 70 different languages [ ]. Although written Facebook conversations are not the same as in-person interactions, we sought to eavesdrop on casual interactions occurring on Facebook to examine jokes about doctors. Therefore, we performed the first study of social networking site conversations pertaining to health and medicine to examine the prevalence, characteristics, and success of doctor jokes posted on Facebook.
The Committee for the Protection of Human Subjects at Dartmouth College reviewed the study protocol and granted this study an expedited Institutional Board Review.
To obtain information on doctor jokes posted on Facebook, we used data from the Harris Interactive Research Lifestreaming Panel. Upon agreeing to become a Lifestreaming Panel participant, these individuals gave Harris permission to record their private conversations on social networking sites such as Facebook and Twitter. Although both Facebook and Twitter could potentially be used to study jokes about doctors, we were granted access specifically to the Lifestreaming Panel’s Facebook data. Lifestreaming Panel participants are paid the sum of US $1.00 initially, and they are then eligible to participate in future surveys and activities in which they can receive other payments. Harris collects data from Lifestreaming Panel participants’ social networking sites as well as information on the participants’ characteristics. Harris can search Lifestreaming Panel participants’ Facebook walls using algorithms based on keywords. As of June 2011 (the time of our data collection), there were 33,326 adult Lifestreaming Panel participants.
On Facebook, each user creates a profile and has a personal “wall,” a place for conversing with others. For the purposes of this study, we defined a conversation thread as starting with a root post on a user’s wall by either the user or by the user’s “friend,” and including others’ follow-up comments. A fictional example of a conversation thread in which a doctor joke is mentioned can be found in(note: the authors are used to represent Facebook users to protect the identify of study participants).
Identification of Doctor Jokes
Using Harris Interactive Research Lifestreaming Panel Facebook data from December 15, 2010 to June 16, 2011, we identified 30,075 individual posts that included the term “doctor(s)” (). Because posts were identified first by the keyword doctor(s) and then attached to full Facebook wall threads, 60 doctor jokes were made by Facebook users not part of the Lifestreaming Panel (these individuals posted on a Lifestreaming Panel participant’s Facebook wall) and were therefore excluded from our study.
To identify jokes, 2 independent coders read each post that included the term doctor(s) in search of jokes. For practical reasons, coders were asked to only identify what they considered to be canned jokes. A typical canned joke contains an introduction followed by a punch line, and can stand alone as a humorous statement, free from context . Coders identified 442 posts that contained potential canned jokes. Differences in coding were reconciled by a third reviewer. Because Cohen’s kappa statistic can underestimate the interreviewer agreement when analyzing rare events, we also calculated the positive and negative agreement between reviewers [ , ]. The kappa statistic, positive, and negative agreement for initial agreement between reviewers was 0.62, 0.65, and 0.99, respectively ( ).
Three study investigators then read all 442 potential jokes and excluded those that were not canned jokes or that contained multiple embedded jokes. Differences were discussed and resolved by consensus. The process resulted in the identification of 321 posted doctor jokes that represented 156 unique canned jokes (some jokes were repeated). Selected examples of the jokes identified can be found in. We included doctor jokes in our sample whether or not the joke received follow-up posts from the social network.
Characteristics of Jokers
We operationally defined a Lifestreaming Panel participant who posted a doctor joke during the 6-month time period as a joker. We compared sociodemographic characteristics for jokers to nonjokers (participants who did not post a doctor joke on their Facebook wall during the 6-month observation period) and used the total number of Facebook friends at the time of data collection as the size of the participant’s social network. Because of the skewed distribution, we report the median number of friends, as well as number of Facebook fan pages and groups to which the participants belonged.
Characteristics of Doctor Jokes
We categorized each joke into 1 of 2 groups: those that were made at the expense of doctors (defined as jokes in which medical doctors or the medical profession, doctors’ advice, the doctor-patient relationship, or the health care system were the butt of the joke) and those in which this was not the case. We also determined whether or not the joke was a pun (ie, dependent on multiple definitions of a word), used dirty humor (defined as including foul language, sexual content, racism, degradation of women, reference to human waste, or that were otherwise in poor taste), referred to popular media or culture (television, movies, comedians, or advertising), or related to either politics or current events.
We estimated joke effectiveness in 2 different ways. First, we determined whether the joke received at least one electronic laugh (from a person other than the joker) anywhere in the response from the social network. We operationally defined an electronic laugh as containing one of the following responses: laughing out loud (LOL), rolling on the floor laughing (ROTFL), or an interjection (eg, “baha” or “haha”). For the 11 jokes in which an electronic laugh was included with root post by the joker, it was not considered evidence for (or against) a joke’s success .
During the course of the 6-month data collection period, the Facebook feature known as the “like” button that allows members of a network to show enthusiasm for a particular post became popular. As a secondary measure of joke success, we collected the total number of Facebook likes for the 225 jokes in our data that appeared after Harris began collecting data on this feature.
We used Stata version 13.0 statistical software (StataCorp LP, College Station, TX, USA) for all analyses. The chi-square test for categorical variables and the t test for continuous variables were used to compare sociodemographic characteristics of jokers to nonjokers, except for measures of Facebook activity (ie, social network size and the number of fan and group pages to which a participant belonged), which we compared by using a Mann-Whitney test. Missing values were assigned a category for the comparison of characteristics between jokers and nonjokers for categorical variables.
Because some jokes were repeated in our sample, we used generalized linear mixed-effects models that were fit to allow each joke to have a random intercept. Fixed effects in our models included the characteristics of the joke and the covariates for age, sex, and network size as a categorical variable (ie, small vs medium or large social network). To determine if specific characteristics of jokes predicted the success of a joke, we assumed a binomial distribution for our models in which the dependent variable was whether or not the joke received at least one electronic laugh (yes vs no), and a Poisson distribution for our models in which the total number of likes was the dependent variable.
Characteristics of Jokers
Among the 33,326 Facebook users in the Lifestreaming Panel, 29.99% (9994/33,326) mentioned the word doctor during the 6-month observation period, but only 263 (0.79%) posted a doctor joke. Jokers varied by US region (P<.001) and were more heavily represented in the Northeast (the region with the highest density of physicians per capita)  and the South ( ).
Jokers differed from the typical Lifestreaming Panel participant in several ways: they were less educated (eg, 16.0% of jokers reported having graduate training or an advanced degree whereas 20.38% of nonjokers did, P=.02) and they were more likely to be divorced, separated, or widowed (vs married, P<.01). Jokers had larger social networks than nonjokers: jokers had a median of 227 (IQR 138-369) Facebook friends compared to 132 (IQR 56-270) among nonjokers (P<.001).
Of the 156 unique jokes, 112 (71.8%) appeared only once in our data. Of the jokes that were repeated, 2 jokes were particularly popular and were repeated approximately 30 times.
Among the 156 unique doctor jokes, the joke was made at the expense of doctors (and/or the health care system) in approximately half (62/156, 39.7%). In addition, 25.0% (39/156) of jokes relied on dirty humor, 19.9% (31/156) were puns, 14.1% (22/156) pertained to popular culture and media, and 5.8% (9/156) related to current events and politics.
Approximately half of all jokes posted (133/321, 41.4%) received electronic laughter. Jokes made at the expense of doctors were more likely to receive electronic laughter although this did not reach statistical significance (46.5% vs 37.3%, P=.09). The marginal trend (OR 1.46, 95% CI 0.94-2.29) toward a higher rate of electronic laugher in response to jokes at doctors’ expense was only slightly attenuated after adjusting for age, sex, and social network size (). The likelihood of generating an electronic laugh was not dependent on other joke characteristics in both our univariate and adjusted models.
The median number of Facebook likes for doctor jokes was 2 (IQR 0-19). Ironically, the joke with the greatest number of Facebook likes (49 total likes from a network of 253 friends) was a “doctor, priest, lawyer” joke in which lawyers were the butt of the joke.
We observed similar associations between the characteristics of jokes and receiving Facebook likes as a measure of joke success (vs ). Jokes that were at the expense of doctors received nearly 50% more likes (rate ratio [RR] 1.48, 95% CI 0.96-2.27) in our adjusted model ( ). However, jokes that used what we deemed dirty humor were actually less likely to receive Facebook likes, whereas jokes that were based on current events/politics received more than double the amount of Facebook likes (RR 2.36, 95% CI 0.97-5.74; P=.06).
To our knowledge, this is the first study to use actual Facebook conversations to examine doctor-related humor. Overall, we found a low prevalence of doctor jokes on Facebook and relatively few Facebook users posting jokes about doctors (and the health care system in general). Interestingly, those who posted a doctor joke were more likely to be divorced, separated, or widowed, and to have larger social networks (ie, more friends on Facebook). Given the previous findings that people who want to improve their social status are more likely to joke, it may be that divorced, separated, or widowed Facebook users tell doctor jokes to appeal to a potential partner but, of course, we cannot distinguish the reason from these data. Although initially it appeared that poking fun at doctors (as compared to doctor jokes that were not made at the expense of physicians) led to more successful jokes (in generating electronic laughs and the total number of Facebook likes), such findings were not statistically significant. In regards to Facebook likes, jokes based on current events and politics appeared to receive greater response from an individual’s social network, whereas dirty humor jokes received fewer likes.
We also observed that although most jokes appeared only once in our data, a few jokes were repeated many times. Based on our qualitative review of these more highly repeated jokes, they differed little from other jokes in our study. Although we are not able to determine the reason, these findings demonstrate how certain ideas can spread rapidly throughout social networks .
Comparison With Prior Work
In recent years, medicine has not been immune to the impact of social networking sites, and there is growing interest in social networking sites among physicians and biomedical researchers. Social networking sites may have important applications for studying social interaction and communication related to health and medicine [, ]. The medical community has largely focused on discussing the ethics of doctor-patient interaction on social networking sites [ - ] and professionalism of younger practitioners’ exposure via social networking sites [ - ]. Only more recently has interest emerged in using social networking sites to employ health interventions [ , ] and to identify certain health behaviors [ - ]. To date, there have been few empirical studies in the biomedical literature that examined conversations on social networking sites in nonpatient population groups.
Although our study examined doctor jokes posted on Facebook and does not represent a comprehensive analysis of public opinion of the medical profession and health care, our analyses are among the first to examine actual social networking site conversations . Primary analysis of Facebook conversations could provide researchers the ability to examine certain health behaviors and popular opinion pertaining to health and medicine. Furthermore, analysis of social media conversations on a larger scale could have important uses, such as studying US public opinion regarding national health policy, developing new methods for public health surveillance, and for sociological study to understand social support for illness in virtual settings. However, as our study demonstrates, conversations from social media sites contain a mixture of both relevant and (depending on the use) potentially irrelevant material.
Our study has several limitations that must be acknowledged. First, considering that Lifestreaming Panel participants gave permission to have their Facebook data recorded, the potential for selection bias cannot be ruled out. Second, we used the term “doctor(s)” to identify posts pertaining to medical physicians, which may underestimate the total conversations pertaining to physicians, medical practitioners, or the medical profession. Given the casual nature of Facebook, we thought that the term doctor would be used more commonly than a more formal term such as “physician.” Finally, we identified potential jokes for analysis based on our definition of what constituted a joke in Facebook posts; others might have defined jokes differently than we did.
Despite the inherent limitations of our research, this study demonstrates the potential of using social networking sites for research on health and medicine. The adoption of social networking has resulted in growing interest in using outlets such as Facebook and Twitter in creative ways. In this study, we demonstrate how actual data from Facebook conversations can be used to study doctor-related humor. In addition to serving as an example, this study highlights some of the practical considerations regarding the analysis of data from social networking sites.
We thank Rachel P Davis, MS, and Lynne M Morgan, MPH, for assistance with data coding and Harris Interactive for graciously providing the data for this study. Davis was supported by Award Number 5K01AT006162 from the National Institutes of Health. The views expressed herein do not necessarily represent the official views of the National Institutes of Health, the Department of Veterans Affairs, or the US government. The National Institutes of Health, US Department of Veteran Affairs, and Harris Interactive did not have any role in the design and conduct of the study.
Conflicts of Interest
Haney was employed by Harris Interactive during the study, but Harris Interactive had no say or influence over the study design or analysis. There were no other conflicts of interest to declare.
- Fine GA. Humorous interaction and the social construction of meaning: making sense in a jocular vein. Studies in Symbolic Interaction 1984;5:83-104.
- Davis MS. What's So Funny?: The Comic Conception of Culture and Society. Chicago: University of Chicago Press; 1993.
- LaFave L. Humor judgments as a function of reference groups identification classes. In: The Psychology of Humor: Theoretical Perspectives and Empirical Issues. The Psychology of Humor: New York, Academic Press; 1972:195-210.
- LaFave L, Haddad J, Marshall N. Humour judgements as a function of identification classes. Sociology and Social Research 1973;53:184-194.
- Francis LE. Laughter, the best mediation: humor as emotion management in interaction. Symbolic Interaction 1994 May;17(2):147-163. [CrossRef]
- Romero E, Pescosolido A. Humor and group effectiveness. Human Relations 2008 Mar 01;61(3):395-418. [CrossRef]
- Abel MH. Humor, stress, and coping strategies. Humor: International Journal of Humor Research 2002;15(4):365-381. [CrossRef]
- White S, Winzelberg A. Laughter and stress. Humor: International Journal of Humor Research 1992;5(4):343-356. [CrossRef]
- Light D. The medical profession organizational change: From professional dominance to countervailing power. In: Handbook of Medical Sociology. Upper Saddle River, NJ: Prentice Hall; 2000:201-216.
- Pescosolido BA, Tuch SA, Martin JK. The profession of medicine and the public: examining Americans' changing confidence in physician authority from the beginning of the 'health care crisis' to the era of health care reform. J Health Soc Behav 2001 Mar;42(1):1-16. [Medline]
- Wolinsky, Frederic W. The professional dominance, deprofessionalization, proletarianization, corporatization perspectives: An overview synthesis. In: The Changing Medical Profession: An International Perspective. New York: Oxford University Press; 1993:11-24.
- McDonald P. The Independent. 2010 Dec 19. Heard the one about the oldest joke in the world? It's a cracker! URL: http://www.independent.co.uk/voices/commentators/paul-mcdonald-heard-the-one-about-the-oldest-joke-in-the-world-its-a-cracker-2164293.html [accessed 2013-12-06] [WebCite Cache]
- Landon BE, Reschovsky J, Blumenthal D. Changes in career satisfaction among primary care and specialist physicians, 1997-2001. JAMA 2003;289(4):442-449. [Medline]
- Schwartz MD, Durning S, Linzer M, Hauer KE. Changes in medical students' views of internal medicine careers from 1990 to 2007. Arch Intern Med 2011 Apr 25;171(8):744-749. [CrossRef] [Medline]
- Boxer D, Cortés-Conde F. From bonding to biting: conversational joking and identity display. Journal of Pragmatics 1997 Mar;27(3):275-294. [CrossRef]
- Freud S, Strachey J, Gay P. Jokes and Their Relation to the Unconscious. New York: Norton; 1960.
- Sandford S, Eder D. Adolescent humor during peer interaction. Social Psychology Quarterly 1984;47(3):235-243.
- Schoen C, Osborn R, Doty MM, Bishop M, Peugh J, Murukutla N. Toward higher-performance health systems: adults' health care experiences in seven countries, 2007. Health Aff (Millwood) 2007;26(6):w717-w734 [FREE Full text] [CrossRef] [Medline]
- Adamle KN, Ludwick R. Humor in hospice care: who, where, and how much? Am J Hosp Palliat Care 2005;22(4):287-290. [Medline]
- Robinson DT, Smith-Lovin L. Getting a laugh: gender, status, and humor in task discussions. Social Forces 2001 Sep 01;80(1):123-158. [CrossRef]
- Glenn PJ. Initiating shared laughter in multi‐party conversations. Western Journal of Speech Communication 1989 Aug;53(2):127-149. [CrossRef]
- Norrick NR. Conversational Joking: Humor in Everyday Talk. Bloomington: Indiana University Press; 1993.
- Facebook Newsroom. 2013. Facebook key facts URL: http://newsroom.fb.com/Key-Facts [accessed 2014-01-26] [WebCite Cache]
- Attardo S. Linguistic Theories of Humor (Humor Research, No. 1). Berlin: Walter de Gruyter; 1994.
- Cicchetti DV, Feinstein AR. High agreement but low kappa: II. Resolving the paradoxes. J Clin Epidemiol 1990;43(6):551-558. [Medline]
- Feinstein AR, Cicchetti DV. High agreement but low kappa: I. The problems of two paradoxes. J Clin Epidemiol 1990;43(6):543-549. [Medline]
- Goodman DC, Fisher ES, Bronner KK. Hospital and Physician Capacity Update: A Brief Report from the Dartmouth Atlas of Health Care. Hanover, NH: The Dartmouth Institute for Health Policy and Clinical Practice; 2009 Mar 30. URL: http://www.dartmouthatlas.org/downloads/reports/Capacity_Report_2009.pdf [accessed 2014-01-28] [WebCite Cache]
- Watts DJ, Dodds PS. Influentials, networks, and public opinion formation. J Consum Res 2007 Dec;34(4):441-458. [CrossRef]
- Centola D. Social media and the science of health behavior. Circulation 2013 May 28;127(21):2135-2144. [CrossRef] [Medline]
- Moorhead SA, Hazlett DE, Harrison L, Carroll JK, Irwin A, Hoving C. A new dimension of health care: systematic review of the uses, benefits, and limitations of social media for health communication. J Med Internet Res 2013;15(4):e85 [FREE Full text] [CrossRef] [Medline]
- Jain SH. Practicing medicine in the age of Facebook. N Engl J Med 2009 Aug 13;361(7):649-651. [CrossRef] [Medline]
- Lacson SM, Bradley C, Arkfeld DG. Facebook medicine. J Rheumatol 2009 Jan;36(1):211. [CrossRef] [Medline]
- Grover M. Defining the patient-physician relationship in the era of facebook. Acad Med 2010 Aug;85(8):1262. [CrossRef] [Medline]
- Landman MP, Shelton J, Kauffmann RM, Dattilo JB. Guidelines for maintaining a professional compass in the era of social networking. J Surg Educ 2010;67(6):381-386. [CrossRef] [Medline]
- Devi S. Facebook friend request from a patient? Lancet 2011 Apr 2;377(9772):1141-1142. [Medline]
- Fenton CH. A few fears felt using Facebook. BMJ 2011;343:d5619. [Medline]
- Osman A, Wardle A. Is it time for medicine to update its Facebook status? BMJ 2011;343:d6334. [Medline]
- Garner J, O'Sullivan H. Facebook and the professional behaviours of undergraduate medical students. Clin Teach 2010 Jun;7(2):112-115. [CrossRef] [Medline]
- Gray K, Annabell L, Kennedy G. Medical students' use of Facebook to support learning: insights from four case studies. Med Teach 2010;32(12):971-976. [CrossRef] [Medline]
- Alkhateeb FM, Clauson KA, Latif DA. Pharmacist use of social media. Int J Pharm Pract 2011 Apr;19(2):140-142. [CrossRef] [Medline]
- Giordano C, Giordano C. Health professions students' use of social media. J Allied Health 2011;40(2):78-81. [Medline]
- McGinnis MS. Using Facebook as your professional social media presence. Imprint 2011;58(4):36-39. [Medline]
- Moubarak G, Guiot A, Benhamou Y, Benhamou A, Hariri S. Facebook activity of residents and fellows and its impact on the doctor-patient relationship. J Med Ethics 2011 Feb;37(2):101-104. [CrossRef] [Medline]
- Thompson LA, Black E, Duff WP, Paradise Black N, Saliba H, Dawson K. Protected health information on social networking sites: ethical and legal considerations. J Med Internet Res 2011;13(1):e8 [FREE Full text] [CrossRef] [Medline]
- Moreno MA, Vanderstoep A, Parks MR, Zimmerman FJ, Kurth A, Christakis DA. Reducing at-risk adolescents' display of risk behavior on a social networking web site: a randomized controlled pilot intervention trial. Arch Pediatr Adolesc Med 2009 Jan;163(1):35-41. [CrossRef] [Medline]
- Gold J, Pedrana AE, Stoove MA, Chang S, Howard S, Asselin J, et al. Developing health promotion interventions on social networking sites: recommendations from The FaceSpace Project. J Med Internet Res 2012;14(1):e30 [FREE Full text] [CrossRef] [Medline]
- Moreno MA, Christakis DA, Egan KG, Brockman LN, Becker T. Associations between displayed alcohol references on Facebook and problem drinking among college students. Arch Pediatr Adolesc Med 2012 Feb;166(2):157-163 [FREE Full text] [CrossRef] [Medline]
- Moreno MA, Christakis DA, Egan KG, Jelenchick LA, Cox E, Young H, et al. A pilot evaluation of associations between displayed depression references on Facebook and self-reported depression using a clinical scale. J Behav Health Serv Res 2012 Jul;39(3):295-304 [FREE Full text] [CrossRef] [Medline]
- Moreno MA, Egan KG, Brockman L. Development of a researcher codebook for use in evaluating social networking site profiles. J Adolesc Health 2011 Jul;49(1):29-35 [FREE Full text] [CrossRef] [Medline]
- Martinello N, Donelle L. Online conversations among Ontario university students: environmental concerns. Inform Health Soc Care 2012 Sep;37(3):177-189. [CrossRef] [Medline]
|LOL: laughing out loud|
|ROTFL: rolling on the floor laughing|
|RR: rate ratio|
Edited by G Eysenbach; submitted 27.06.13; peer-reviewed by A Roundtree, J Yaphe; comments to author 17.09.13; revised version received 10.12.13; accepted 15.01.14; published 13.02.14
©Matthew A Davis, Carol Sue Haney, William B Weeks, Brenda E Sirovich, Denise L Anthony. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 13.02.2014.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on http://www.jmir.org/, as well as this copyright and license information must be included.