Making money out of social networking sites is not that easy,in fact  a year later, AOL Is contemplating a Bebo sale.  All the major social networking sites are struggling in finding a viable business model. But who uses these websites?A Facebook Pages Tracker  helps us understand something about the phenomenon.

In Facebook, the top five fan pages are:

1. Barack Obama (4,544,050 fans)
2. Coca-Cola 2,286,085 (fans)
3. Homer J Simpson (2,230,644 (fans)
4. Nutella (2,109,429 fans)
5. Pizza (2,050,050 fans)