Facebook seems to be unstoppable. With over 550,000 million people on Facebook, is there room for other social networks? While there is power in numbers, social networkers will be exploring more niche communities or alternatives as they seek for greater exclusivity or privacy.

There are plenty of options and it will be interesting to see how it all shakes out. For instance, Path, billed as “the personal network” and “a place to be yourself,” limits members to 50 connections.

Other options include Appleseed, OneSocialWeb, Diaspora, Pip.io, The Fridge and College Only as well as DIY social networks, invite-only offerings and student networks that go back to Facebook’s roots.

So, watch for counter-moves from Facebook, which has already responded with Groups features.

Source: JWT 100 Things to Watch in 2011