If you're one of the founders, all I can say is stop doing stupid shit. I don't mean to offend-- finding pictures and clever captioning them is surprisingly addictive, but this really is a step away from social-games' Skinnerian conditioning. In short, it's addictive, not fulfilling.
Diaspora started out wanting to change the world-- creating something addictive may be profitable, but as other commenters say, underwhelming.