I think by definition there will be either one global social network or open standard that allows people to find each other regardless of which social network t

I think by definition there will be either one global social network or open standard that allows people to find each other regardless of which social network they're on. Facebook took it's sweet time to deeply integrate in the web like a cancer spread in the body and this is largely due to the failure of creating/adopting a standardized social networking protocol. Thus, in my opinion FB should have be replaced by an open identity, content protocols otherwise it's here to stay on the web filling this need. Also FB the company is here to stay since they bought all the major social networks while everyone is watching.