SAY Media declares that this has been the year of the niche social network:

There was a time when the conventional wisdom said that there was no need for any social network other than Facebook; those days are long gone. Now that Facebook has become a wasteland of app invites, political shouting, and re-shared pictures of kittens for literally everyone and their mothers, it has come to pass that people want social networks centered around a shared interest or community.

This was inevitable. Just as we saw with blogs and forums back in the day, the tendency is for these things to fragment into smaller groups around inch interests over time. The internet still remains the place where a million niches bloom, rather than a land of giants.

SAY has a list of nine small networks that prove its point.