No. Social networks are only useful when you can access a critical mass of your friends in one network. Thus, fragmentation of social networks reduces their utility for most people.

Uber geeks may want to try something else, but for most people facebook works and thats what counts.

The thing that would allow growth of some networks would be an open id style profile API so that I can interact with users from social network X from within social network Y. But why would any leading social network adopt such an API?