This is silly. Social networking requires critical mass, else it's useless. Something like 2% - 5% of users pay for freemium services. So imagine if you had on

This is silly. Social networking requires critical mass, else it's useless. Something like 2% - 5% of users pay for freemium services. So imagine if you had only 2% of your friends on FourSquare, or Facebook, or Twitter. Much less valuable, no? Also, These companies can make far more money via other business models. Users > Revenues for some consumer startups. Grow now, monetize later.