1. The dangers of spam on social networking sites, 〈http://www/allspammedup.com/2008/12/the-dangers-of-spam-on-social-networking-sites/〉.
2. 〈http://perspectives.mvdirona.com/default,date,2008-07-16.aspx〉.
3. 〈http://www.scribd.com/doc/35222/Flickr-Architecture-Presentation〉.
4. 〈http://hurvitz.org/blog/2008/06/linkedin-architecture〉.
5. 〈http://perspectives.mvdirona.com/2008/12/27/MySpaceArchitectureAndNet.aspx〉.