Published on 04.02.14 in Vol 16, No 2 (2014): February
The 1% Rule in Four Digital Health Social Networks: An Observational Study
Background: In recent years, cyberculture has informally reported a phenomenon named the 1% rule, or 90-9-1 principle, which seeks to explain participatory patterns and network effects within Internet communities. The rule states that 90% of actors observe and do not participate, 9% contribute sparingly, and 1% of actors create the vast majority of new content. This 90%, 9%, and 1% are also known as Lurkers, Contributors, and Superusers, respectively. To date, very little empirical research has been conducted to verify the 1% rule.
Objective: The 1% rule is widely accepted in digital marketing. Our goal was to determine if the 1% rule applies to moderated Digital Health Social Networks (DHSNs) designed to facilitate behavior change.
Methods: To help gain insight into participatory patterns, descriptive data were extracted from four long-standing DHSNs: the AlcoholHelpCenter, DepressionCenter, PanicCenter, and StopSmokingCenter sites.
Results: During the study period, 63,990 actors created 578,349 posts. Less than 25% of actors made one or more posts. The applicability of the 1% rule was confirmed as Lurkers, Contributors, and Superusers accounted for a weighted average of 1.3% (n=4668), 24.0% (n=88,732), and 74.7% (n=276,034) of content.
Conclusions: The 1% rule was consistent across the four DHSNs. As social network sustainability requires fresh content and timely interactions, these results are important for organizations actively promoting and managing Internet communities. Superusers generate the vast majority of traffic and create value, so their recruitment and retention is imperative for long-term success. Although Lurkers may benefit from observing interactions between Superusers and Contributors, they generate limited or no network value. The results of this study indicate that DHSNs may be optimized to produce network effects, positive externalities, and bandwagon effects. Further research in the development and expansion of DHSNs is required.
J Med Internet Res 2014;16(2):e33
- social networks;
- 1% rule;
- Pareto Principal;
- 90-9-1 principle;
- moderated support
Research examining digital health social networks (DHSNs) and their feasibility to improve health began in the mid-1980s [, ]. As these networks became increasingly available, studies focused on relationships between network size, structure, program sustainability [ - ], and motivations of participants [ ].
Terminology also developed to define common roles and behavior. For example, members of social networking sites (SNS) are now commonly referred to as actors . Lurking (or passively reading social network conversations without actively participating) is the most common behavior [ ]. Conversely, common to SNS are actors who frequently generate content and facilitate discussions [ - ]. In practice, these actors are often referred to as Superusers [ ]. The impact or value that Lurkers, Superusers, or other actors have within DHSNs has not been empirically examined.
Network Effects and Positive Network Externalities
To frame their value, it may be beneficial to view Lurkers, Contributors, and Superusers and other actors through the lens of sociology, political science, economics, and finance where there is a rich history of examining network effects. A network effect occurs when an individual’s use of a good or service influences its perceived value [, ].
An example of a network effect can be seen in the popularity and growth of the fax machine. When few organizations had fax machines, the value of having a fax machine was low. However, as more organizations purchased fax machines and quickly and efficiently communicated with other departments or organizations, the network of fax machines grew and so did the value of owning one. Over time, having a fax machine in the workplace became essential. This is also known as the bandwagon effect, where the demand for a good increases because others are consuming it .
In the above example, the addition of each fax machine created a positive externality . Positive externalities contribute to growth and popularity of a product or good, and social science research is now beginning to investigate this phenomenon within SNS [ ].
Introducing the concept of network effects and positive externalities can help explain the importance of recruiting, retaining, and managing different types of actors to help grow DHSNs. If growing a DHSN increases program efficacy, it is important to understand the mechanisms behind content generation and how to increase network effects.
The 1% Rule (90-9-1 Principle)
Mirroring the well-established Pareto Principle, also known as the 80-20 rule , cyberculture and digital marketing have informally adopted a phenomenon named the 1% rule, or 90-9-1 principle [ , ]. Following the principals of a power law, the Pareto Principle is a natural observation illustrating that roughly 80% of effects come from 20% of causes [ ]. Similarly, the 90-9-1 principle states that 90% of SNS actors observe and do not participate, 9% contribute sparingly, and 1% create the vast majority of new content. This 90%, 9%, and 1% are also known as Lurkers, Contributors, and Superusers. To date very little empirical research has been conducted to verify the 1% rule.
The purpose of this study was to examine if the 1% rule applied to moderated DHSNs designed to facilitate behavior change. Paid employees who were trained in social cognitive theory , motivational interviewing [ ], the stages of change [ ], and cognitive behavioral therapy (CBT) [ ] actively moderated the four DHSNs in this study. Moderator roles focused on facilitating discussions, encouraging problem solving among members, administering compliance with privacy protection rules, protecting the community from spam, and ensuring that all discussions focused on adherence to behavior-change principles.
Furthermore, if DHSNs are efficacious, is it possible to create network effects to increase wellness on a population level? If size of the network matters, how are positive externalities created? More importantly, how do different actors interact and is it possible to create bandwagon effects?
Settings and Program Descriptions
To verify the 1% rule, this observational study analyzed descriptive data from four eHealth interventions that contain large social networks. The four Internet interventions are AlcoholHelpCenter (problem drinking) , DepressionCenter (depression) [ ], PanicCenter (panic) [ ], and StopSmokingCenter (smoking cessation) [ ].
All four DHSNs are online, free to participants, do not offer advertising, do not promote any products, and are a part of Evolution Health Systems Inc’s (EHS) social business model. EHS is a private, research-based organization that builds evidence-based digital programs designed to increase medication and treatment adherence. The four DHSNs analyzed in this study were originally built by EHS for research purposes.
During the study period, moderators consistently monitored each DHSN, reviewed all 578,349 DHSN posts, and checked for their accuracy and consistency. Posts that did not specifically address behavior change or comply with program rules were removed.
Full descriptions of each intervention appear elsewhere [- ]. The oldest of the four DHSNs was nearly 11 years in operation at time of this study, and functionality of each DHSN has been enhanced over time. For explanatory purposes, outlines the main features of each program.
Retrospective data were extracted from each program’s structured query language (SQL) database. Descriptive statistics were analyzed in SPSS version 19 for Mac.
All data collection procedures adhered to international privacy guidelines [- ] and were in accordance with the Helsinki Declaration of 1975, as revised in 2008 [ ]. The study was consistent with the University Research Ethics Committee procedures at Henley Business School, University of Reading, and was exempt from full review.
|Problem drinking||Depression||Panic disorder||Smoking cessation|
|Moderated social network||✓||✓||✓||✓|
|Tailored behavior-change program||✓||✓||✓||✓|
|Private messaging among members||−||✓||−||✓|
|Gamification (techniques to increase usability leveraging desire for achievement, rewards, and competition)||−||✓||−||✓|
Registrants and Study Duration
The four DHSNs had varying numbers of members and life spans (see). Periods of analysis ranged from 4.0 years (problem drinking) to 10.9 years (smoking cessation).
The dataset was purged of moderator accounts to ensure that all content originated only from registered members. Only registered members could actively contribute to discussions; however, registration was not required to read or review all existing or newly generated content.
|Problem drinking||Depression||Panic disorder||Smoking cessation|
|Date of first post||July 25, 2008||April 5, 2003||January 7, 2002||September 17, 2001|
|Date of last post||August 7, 2012||August 5, 2012||August 7, 2012||August 7, 2012|
|Number of days||1474||3411||3866||3978|
Descriptive statistics revealed that less than 25% of actors in each DHSN authored one or more posts (see).
Post frequencies in each of the four DHSNs were divided into the top 1% (Superusers), the next 9% (Contributors), and the remaining 90% (Lurkers) of actors. Each DHSN revealed similar patterns, with Superusers generating 59.0%-75.0%, Contributors authoring 23.8%-37.4%, and Lurkers only creating 1.1%-7.8% of all posts (seeand ).
|Problem drinking||Depression||Panic disorder||Smoking cessation||Total||Mean||Weighted mean|
|Actors who made at least one post, n (%)||449 (17.3)||1230 (23.9)||2767 (24.3)||7963 (17.7)||12409 (19.4)||3102 (19.4)||6193 (19.4)|
|Problem drinking||Depression||Panic disorder||Smoking cessation||Total||Mean||Weighted mean|
|Total population (n)||2597||5151||11,372||44,870||63,990||15,998||40,875|
|Total social network posts||7148||12,583||45,032||513,586||578,349||144,587||369,434|
|1% of population (Superusers)||26||52||114||449||641||160||415|
|Total posts by Superusers||4219||7,432||28,403||385,361||425,415||106,354||276,034|
|Percentage of posts by Superusers, %||59.0||59.1||63.1||75.0||73.6||73.6||74.7|
|9% of population (Contributors)||234||464||1023||4038||5759||2880||3572|
|Total posts by Contributors||2674||4,170||13,814||122,408||143,066||35,767||88,732|
|Percentage of posts by Contributors, %||37.4||33.1||30.7||23.8||24.7||24.7||24.0|
|90% of population (Lurkers)||2337||4636||10,235||40,383||57,590||14,398||27,246|
|Total posts by Lurkers||255||981||2815||5817||9868||2467||4668|
|Percentage of posts by Lurkers, %||3.6||7.8||6.3||1.1||1.7||1.7||1.3|
The 1% (Superusers)
On average, the top 1% (n=160) of Superusers created 73.6% (n=106,354) of posts. On an individual program level, the top 1% varied in their overall contributions, but in all cases accounted for the majority of activity, with a weighted average of posts being 74.7% (n=276,034).
The Next 9% (Contributors)
The second highest group of contributors, or the next 9% of the population, accounted for an average of 24.7% (n=35,767), with a weighted average of 24.0% (n=88,732) of posts.
The Remaining 90% (Lurkers)
The remaining 90% of the population accounted for an average of 1.7% (n=2467) of posts, with a weighted average of 1.3% (4668) of posts.
Cumulatively, Lurkers accounted for the vast majority of the population in the four DHSNs (n=57,590); however, this population created only 1.7% (n=9868) posts. Conversely, Superusers accounted for a small amount of actors (n=641) but created 73.6% (n=425,415) posts (see).
Based on the overwhelming creation of content from a small number of Superusers and underwhelming amount of number of posts from a large number of lurkers, cyberculture’s 1% rule applies to the creation of positive network externalities in the four DHSNs analyzed in this study.
Superusers accounted for a weighted average of 74.7% of content and generated the vast majority of posts within the four DHSNs. These findings match criteria of the 1% rule and may be comparable to the Pareto Principle.
Conversely, Lurkers generated limited or no network value. Although Lurkers may benefit from observing interactions between Superusers and Contributors, they do not generate network effects nor do they contribute to the network growth.
In regards to Superuser participation, motivations and posting patterns in the DHSNs have been previously examined. A 2008 analysis of the problem drinking DHSN found that common themes included introductions, greetings, general supportive statements, suggested strategies, success stories, and discussion of difficulties . In addition, this study found that the amount of discussions varied over time and clustered around nodes consisting of one or more Superusers. A 2010 publication on the smoking cessation DHSN found that the majority of first posts were from recent quitters who were struggling with their quit attempts. Responses were rapid and from seasoned quitters, indicating that the social network may be particularly beneficial for peer support to help relapse prevention [ ].
Content analysis has also been conducted on the four DHSNs. A 2009 academic presentation found that a high proportion of first posts in the panic disorder DHSN resembled “panic stories”, suggesting that the network may act as an expressive writing forum . A 2010 academic presentation on the same community found that the support group was used more often by those reporting greater intensity of panic symptoms, absenteeism from work, and that Lurkers completed a greater number of the program’s CBT treatment sessions compared to Contributors and Superusers [ ]. A recent University of Toronto PhD dissertation found that depression DHSN users generally sought informational support, various types of emotional support, coaching support, and social companionship [ ]. Future research should focus on possible differences between post frequencies and content themes that may be prevalent in different indications, disease states, or actor types.
Based on the observations in this study, health care organizations should focus efforts on recruiting and retaining Superusers. Superusers may have a wide range of options to focus their participation, whether on health-related social networks or those of general interest. Moreover, they may exhibit different patterns of network behavior in different communities . The motivations, needs, and participatory patterns of Lurkers and Contributors should also be examined. Future research should focus on the demographic and psychographic characteristics of these three actor-types.
It is also important to consider that the actions of some Superusers may result in negative network externalities. This type of behavior may result in negative network effects and decrease the size of the network. Conversely, Superusers may generate positive network effects in digital resources that are negatively oriented towards health, promoting illness, or disease .
An increasing number of health care organizations are making digital health care tools available to their patients, policyholders, or consumers, and many of them contain social networks. While some DHSNs flourish, many suffer from little or no traffic . Strategies increasing Superuser and Contributor participation can increase the effectiveness of these programs.
A successful DHSN requires active managers who not only guide discussions but also facilitate growth . The findings from this paper indicated that managers of DHSNs should identify Superusers early, encourage their participation, and target their recruitment though offline initiatives. Managers should not expend resources on promoting engagement with Lurkers.
Strengths and Limitations
A strength of this study is that the four DHSNs have never been promoted or advertised as they are not commercial entities. Participants in the four programs in this study could find the DHSNs only through extensive search efforts, links from other websites, or word-of-mouth. Profit-driven commercial entities focus considerable efforts and budgets on recruitment and promotion (free trials, banner advertising, celebrity endorsement, offline promotion, and other incentives) and most likely attract much larger populations with different motivations . As a result of non-promotion, the four DHSNs in this study may have attracted only naturalistic, self-seeking health populations.
However, lack of advertising or promotion may also be a limitation. The naturalistic self-seeking population of actors within these networks may not be representative of populations that are typically reached from well-promoted programs. Many organizations or trials have promotional or recruitment budgets, thus casting a wider net and attracting a variety of health populations.
Especially in a climate of limited budgets and funding, the influence of promotion or non-promotion should encourage organizations with DHSNs to carefully consider the role of advertising and recruitment, and if those efforts should be strategically targeted.
Finally, only data from registered users were examined. Any visitor could browse the DHSNs without registering, but it is not possible to reliably examine this data nor combine it with the behavior of registered users.
The 1% rule was consistent across the four DHSNs. However, as individuals can lurk without registering, the 1% (Superusers) may represent an even smaller population. As social network sustainability requires fresh content and timely interactions, these results are important for organizations actively promoting and managing DHSNs.
Superusers generate the vast majority of traffic and create value, so their recruitment and retention is imperative for long-term success. Although Lurkers may benefit from observing interactions between Superusers and Contributors, they generate limited or no network value.
The results of this study indicate that DHSNs have the potential to be optimized to produce network effects, positive externalities, and bandwagon effects. Further research in the development, expansion, and management policies of DHSNs is required.
The author would like to thank Dr Douglass Hyatt, Professor of Business Economics at the Rotman School of Management at the University of Toronto for his input on network effects and comments on the study design.
Conflicts of Interest
Trevor van Mierlo is the CEO & Founder of Evolution Health Systems Inc, the owner of the sites AlcoholHelpCenter, DepressionCenter, PanicCenter, and StopSmokingCenter, as well as other eHealth and mHealth platforms.
- Robinson TN, Walters PA. Health-net: an interactive computer network for campus health promotion. J Am Coll Health 1986 Jun;34(6):284-285. [CrossRef] [Medline]
- Schneider SJ. Trial of an on-line behavioral smoking cessation program. Computers in Human Behavior 1986 Jan;2(4):277-286. [CrossRef]
- Cobb NK, Graham AL, Abrams DB. Social network structure of a large online community for smoking cessation. Am J Public Health 2010 Jul;100(7):1282-1289 [FREE Full text] [CrossRef] [Medline]
- Stoddard JL, Augustson EM, Moser RP. Effect of adding a virtual community (bulletin board) to smokefree.gov: randomized controlled trial. J Med Internet Res 2008;10(5):e53 [FREE Full text] [CrossRef] [Medline]
- Zbikowski SM, Hapgood J, Smucker Barnwell S, McAfee T. Phone and web-based tobacco cessation treatment: real-world utilization patterns and outcomes for 11,000 tobacco users. J Med Internet Res 2008;10(5):e41 [FREE Full text] [CrossRef] [Medline]
- Welbourne JLL, Blanchard AL, Wadsworth MB. Motivations in virtual health communities and their relationship to community, connectedness and stress. Computers in Human Behavior 2013 Jan;29(1):129-139. [CrossRef]
- Newman MEJ. The Structure and Function of Complex Networks. SIAM Rev 2003 Jan;45(2):167-256. [CrossRef]
- Schneider A, von Krogh G, Jäger P. “What’s coming next?” Epistemic curiosity and lurking behavior in online communities. Computers in Human Behavior 2013 Jan;29(1):293-303. [CrossRef]
- Cunningham JA, van Mierlo T, Fournier R. An online support group for problem drinkers: AlcoholHelpCenter.net. Patient Educ Couns 2008 Feb;70(2):193-198. [CrossRef] [Medline]
- Jones R, Sharkey S, Smithson J, Ford T, Emmens T, Hewis E, et al. Using metrics to describe the participative stances of members within discussion forums. J Med Internet Res 2011;13(1):e3 [FREE Full text] [CrossRef] [Medline]
- Selby P, van Mierlo T, Voci SC, Parent D, Cunningham JA. Online social and professional support for smokers trying to quit: an exploration of first time posts from 2562 members. J Med Internet Res 2010;12(3):e34 [FREE Full text] [CrossRef] [Medline]
- Zhao K, Greer G, Qiu B, Mitra P, Portier K, Yen J. Working Paper. 2012. Finding influential users of an online health community: a new metric based on sentiment influence URL: http://arxiv.org/pdf/1211.6086v2.pdf [accessed 2014-01-20] [WebCite Cache]
- Binks M, van Mierlo T. Utilization patterns and user characteristics of an ad libitum Internet weight loss program. J Med Internet Res 2010;12(1):e9 [FREE Full text] [CrossRef] [Medline]
- Grabher G, Stark D. Organizing Diversity: Evolutionary Theory, Network Analysis and Postsocialism. Regional Studies 1997 Jul;31(5):533-544. [CrossRef]
- Uzzi B. The Sources and Consequences of Embeddedness for the Economic Performance of Organizations: The Network Effect. American Sociological Review 1996 Aug;61(4):674-698 [FREE Full text] [CrossRef]
- Leibenstein H. Bandwagon, Snob, and Veblen Effects in the Theory of Consumers' Demand. The Quarterly Journal of Economics 1950 May;64(2):183-207. [CrossRef]
- Katz ML, Shapiro C. Network Externalities, Competition, and Compatibility. The American Economic Review 1985;75(3):424-440.
- Lin KY, Lu HP. Why people use social networking sites: An empirical study integrating network externalities and motivation theory. Computers in Human Behavior 2011 May;27(3):1152-1161. [CrossRef]
- Sanders R. The Pareto Principle: its Use and Abuse. Journal of Product & Brand Management 1992;1(2):37-40. [CrossRef]
- Nielsen J. Participation inequality: lurkers vs contributors in internet communities. URL: http://www.nngroup.com/articles/participation-inequality/ [accessed 2013-09-18] [WebCite Cache]
- Arthur C. The Guardian. 2006 Jul 20. What is the 1% rule? URL: http://www.theguardian.com/technology/2006/jul/20/guardianweeklytechnologysection2 [accessed 2013-09-18] [WebCite Cache]
- Newman MEJ. Power laws, Pareto distributions and Zipf's law. Contemporary Physics 2005 Sep;46(5):323-351. [CrossRef]
- McAlister L, Perry C, Parcel GS. How Individuals, Environments, and Health Behaviors Interact. In: Glanz K, Rimer BK, Viswanath K, editors. Health behavior and health education: theory, research, and practice. San Francisco: Jossey-Bass; 2008.
- Miller WR, Rollnick S. Motivational Interviewing, Second Edition: Preparing People for Change. New York: The Guilford Press; 2002.
- Freeman A, Dolan M. Revisiting prochaska and DiClemente's stages of change theory: An expansion and specification to aid in treatment planning and outcome evaluation. Cognitive and Behavioral Practice 2001 Jun;8(3):224-234. [CrossRef]
- Butler AC, Chapman JE, Forman EM, Beck AT. The empirical status of cognitive-behavioral therapy: a review of meta-analyses. Clin Psychol Rev 2006 Jan;26(1):17-31. [CrossRef] [Medline]
- Evolution Health Systems Inc. AlcoholHelpCenter.net. URL: http://www.alcoholhelpcenter.net/ [accessed 2014-01-20] [WebCite Cache]
- Evolution Health Systems Inc. Depression Center.net. URL: http://www.depressioncenter.net/ [accessed 2014-01-20] [WebCite Cache]
- Evolution Health Systems Inc. PanicCenter.net. URL: http://www.paniccenter.net/ [accessed 2014-01-20] [WebCite Cache]
- Evolution Health Systems Inc. StopSmokingCenter.net. URL: http://www.stopsmokingcenter.net/ [accessed 2014-01-20] [WebCite Cache]
- Cunningham JA. Comparison of two internet-based interventions for problem drinkers: randomized controlled trial. J Med Internet Res 2012;14(4):e107 [FREE Full text] [CrossRef] [Medline]
- Farvolden P, Cunningham JA, Selby P. Using E-Health Programs to Overcome Barriers to the Effective Treatment of Mental Health and Addiction Problems. Journal of Technology in Human Services 2009 Feb 03;27(1):5-22. [CrossRef]
- Farvolden P, Denisoff E, Selby P, Bagby RM, Rudy L. Usage and longitudinal effectiveness of a Web-based self-help cognitive behavioral therapy program for panic disorder. J Med Internet Res 2005;7(1):e7 [FREE Full text] [CrossRef] [Medline]
- Pike KJ, Rabius V, McAlister A, Geiger A. American Cancer Society's QuitLink: randomized trial of Internet assistance. Nicotine Tob Res 2007 Mar;9(3):415-420. [CrossRef] [Medline]
- European Parliament and the Council of the European Union. Directive/58/EC of the European Parliament and of the Council of 12 July Concerning the Processing of Personal Data and the Protection of in the Electronic Communications Sector (Directive on Privacy and Electronic Communications). 2002. URL: http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:32002L0058:en:HTML [accessed 2014-01-20] [WebCite Cache]
- Office of the Privacy Commissiners of Canada. Personal Information Protection and Electronic Documents Act. 2006. URL: http://www.priv.gc.ca/legislation/02_06_01_e.cfm [accessed 2010-02-02] [WebCite Cache]
- US Department of Health & Human Services. 2003. Summary of the HIPAA Privacy Rule URL: http://www.hhs.gov/ocr/hipaa/ [accessed 2008-05-08] [WebCite Cache]
- Declaration of Helsinki: ethical principles for medical research involving human subjects. 2008. URL: http://www.wma.net/en/30publications/10policies/b3/index.html [accessed 2011-05-26] [WebCite Cache]
- Hood H, Vorstenbach V, John B, Kloke S, Farvolden P, Anthony MM, et al. Tell Me About It! Content Analysis of Support Group Discussion on a Web-based Panic Disorder Treatment Program. 2009 Presented at: Annual meeting of the Association for Behavioral and Cognitive Therapies; November 19-22, 2009; New York, NY.
- Vorstenbach V, Hood H, Farvolden P, Anthony MM, van Mierlo T. The Utility of an Online Support Group for Treatment Adhernece to a Web-Based CBT Program for Panic Disorder. 2010 Presented at: World Congress of Behavioral and Cognitive Therapies; June 2-5, 2010; Boston, MA.
- Sugimoto S. Support Exchange on the Internet: A Content Analysis of an Online Support Group for People Living with Depression. In: Unpublished doctoral dissertation. Toronto: University of Toronto; 2013.
- van Mierlo T, Fournier R, McGowan A, Selby P. All Superusers are not created equal: contributory patterns observed in four separate digital health social networks proming health behavior change. 2013 Presented at: Medicine 2.0: World Congress on Social Media, Mobile Apps, Internet / Web 2.0; September 23-24, 2013; London, UK.
- Jade. Proana: Anorexia is a lifestyle, not a disease. 2013. URL: http://proanalifestyle.blogspot.ca/ [accessed 2014-01-20] [WebCite Cache]
- Bender JL, Jimenez-Marroquin MC, Ferris LE, Katz J, Jadad AR. Online communities for breast cancer survivors: a review and analysis of their characteristics and levels of use. Support Care Cancer 2013 May;21(5):1253-1263. [CrossRef] [Medline]
- Young C. Community management that works: how to build and sustain a thriving online health community. J Med Internet Res 2013;15(6):e119 [FREE Full text] [CrossRef] [Medline]
- Denos M. MarketingProfs. 2013. A Weight Watchers Case Study: How Smart Marketing Pays Off URL: http://www.marketingprofs.com/articles/2013/10422/a-weight-watchers-case-study-how-smart-marketing-pays-off [accessed 2014-01-20] [WebCite Cache]
|CBT: cognitive behavioral therapy|
|DHSN: digital health social networks|
|SNS: social networking sites|
|SQL: structured query language|
Edited by H Riper; submitted 18.09.13; peer-reviewed by D De Beurs, S McIntosh; comments to author 11.11.13; revised version received 21.12.13; accepted 10.01.14; published 04.02.14
©Trevor van Mierlo. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 04.02.2014.
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.