1. Opportunities and challenges of online data collection for suicide prevention 
Qijin Cheng, Shu-Sen Chang, Paul SF Yip 
The Lancet 
Volume 379, Issue 9830, Pages e53-e54 (May 2012)
DOI: /S (12)
Copyright © 2012 Elsevier Ltd Terms and Conditions

2. Figure Increasing users of online social networking sites
Facebook was founded in June, 2004, and is often blocked in China. Sina Weibo was founded in August, Data sources: * † China Internet Network Information Center; ‡Facebook Statistics, Facebook IPO registration statement; §Sina Corporation Financial Reports.
The Lancet  , e53-e54DOI: ( /S (12) )
Copyright © 2012 Elsevier Ltd Terms and Conditions