1. The State of Social Networks 2011 UpdateDebbie GinsbergMarch 30, 2011
2. By the numbers Wikipedia, List of social networking websites, sorted by registered users http://en.wikipedia.org/wiki/List_of_social_networking_websites
12. Establish personal and professional connections Although you’re far, Aphrodite, http://www.flickr.com/photos/57054262@N00/66231929/
13. Control personal and professional reputations Everyone knows everyone from flickr, eskimoblood, http://www.flickr.com/photos/eskimoblood/2111672366/