A few statements related to subject: 1) 500mln have joined FB. Why others didn't? Isn't it because FB has nothing really valuable to offer them? 2) If FB conti

A few statements related to subject: 1) 500mln have joined FB. Why others didn't? Isn't it because FB has nothing really valuable to offer them? 2) If FB continue trying to become all-internet-in-one-company then they will soon follow Yahoo. 3) Future belongs to specialized social networks utilizing unified social protocols and APIs (not developed yet). LinkedIn is one of early birds. More to come.