While "social" is sort of mainstream (in the sense that everyone and their mother is on Facebook), there's hardly any money in it. The vast majority of Internet

While "social" is sort of mainstream (in the sense that everyone and their mother is on Facebook), there's hardly any money in it. The vast majority of Internet users spend their time doing three things on the web: Facebook, e-mail, and time wasters like games & YouTube. So while the userbase is certainly very large, the revenue potential is very limited outside of those core activities.