3. Twitter : individual user stats (from http://dcortesi.com/2007/12/27/twitter-stats/ , via Jean)
4. Twitter : friends networks (from http://bvlg.blogspot.com/2007/04/twitter-vrienden.html , via Jean)
5. The World According to the Blogosphere The World According to The Australian (and The Sun ) (from http://www.observatoiredesmedias.com/2008/03/24/le-monde-dans-les-yeux-dun-redac-chef-lamericaine-version/ )
6.
7. Last.fm : geographic distribution of users (from http://visualizinglastfm.de/einfuehrung.html )