In discussing about social networks, we often tend to forget equally thriving forums and communities like Yahoo answers and Yahoo Groups(what’s that – a social network on email?). Taking them into the fold, here are the biggest online social communities in the US in terms of the market share of visits in the month of August 2009:

1. Facebook : 39.53%
2. MySpace : 23.65%
3. Youtube : 13.16%
4. Tagged : 1.69%
5. Twitter : 1.40%
6. Yahoo Answers : 1.24%
7. myYearBook : 0.83%
8. Yahoo Profiles : 0.61%
9. Yahoo Groups : 0.56%
10. Windows Live Home : 0.45%

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