Right... at this point Facebook is where the people are that other people want to communicate with. Facebook has the massive "directory" of users. Social netw

Right... at this point Facebook is where the people are that other people want to communicate with. Facebook has the massive "directory" of users. Social networks are only useful to people if the other people with whom they want to communicate are ON those networks. Right now, Facebook has that massive directory. This can change, of course. The Internet does not have permanent favorites. But today, Facebook is where you can easily find and interact with people.