61% The percentage of adults who look online for health information.
60% The percentage e-patients (37% of adults) who have accessed or created user-generated health information online.
41% The percentage of e-patients who have read someone else's commentary or experience about health or medical issues on an online news group, website, or blog.
22% The percentage of e-patient social networking site users who have followed their friends' personal health experiences or updates on the site.
12% The percentage of e-patient Twitterers who have posted comments, queries, or information about health or medical matters.
http://pewinternet.org/Reports/2009/8-The-Social-Life-of-Health-Information.aspx
