rocco - 10:22 pm on Jun 23, 2009 (gmt 0)
gmail, hotmail, etc - these are pretty much social networks already, the nodes (email addresses) exist, it is just not so obvious. the real interesting data is stored on the free email service servers, like the confirmation mails of amazon purchases or memberships to adult websites. dont let me mention the search data or the browsing behaviour which they have. facebook is even in its core miles away from microsoft or google.