Researchers from the University of Iowa (IU) and Truth Initiative, a nonprofit organisation in the US, examined the tobacco use of over 2,600 smokers who participated in a social network called 'BecomeAnEX', which they created in 2008.
They found that 21 per cent of those classified as active users after their first week in the community reported that they quit smoking three months later.
Those who were less active in the community were less likely to quit.
"How central you become in the online social network after the first week is a good indicator of whether you will quit smoking," said Kang Zhao, assistant professor at UI.
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The BecomeAnEX website enables members to share information and support through blogs, forums and messages.
Although the site is focused on smoking cessation, users can post on any topic. More than 800,000 users have registered since the site launched in 2008.
The study constructed a large-scale social network based on users' posting habits. A key finding was that increasing integration into the social network was a significant predictor of subsequent abstinence, researchers said.
After three months, 21 per cent of active users - or those who actively contributed content in the community - quit smoking.
About 11 per cent of passive users - those who only read others' posts - quit smoking; and only eight per cent of study participants that never visited quit smoking.
"Spending time with others who are actively engaged in quitting smoking in a place where being a nonsmoker is supported and encouraged gives smokers the practical advice and support they need to stay with a difficult behaviour change," said Amanda Graham, senior vice president, Innovations, of Truth Initiative.
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