Would you use a Bitcoin social network if such existed?
Also if someone is interested in helping develop one, you can post here.
I think the current niche size is way too small to be viable, useful, or profitable. I could be wrong.
Something that I certainly see the need for is an anonymous social network that collects zero information on its users, has strict rules about outing people, strips pictures and content of the identifying metadata, and allows connections based upon "interests" (or likes) alone eliminating the need to KYConn (know your connection).
It's the kind of idea that makes big data and big brother throw up in their data mining mouths, but one that I believe a certain type of user is very hungry for. Many Bitcoiners would likely see value in such an outlet. Screw facecrack, twatter, Puketerest, and all the other look at me social networks. I want something where I can be as openly narcissistic as the fools on the other outlets are without claiming ownership of my personality disorder. I envision a TOR based site with a clearnet mirror for browsing by TORtards.
Give me a global social media outlet that provides a faceless and nameless space to socialize with my keyboard comrades; and I'll be first in line.
Monetizing it would be the challenge, but I'm sure it could be done.