Very interesting. I just signed up to give it a try.
Did you ever toy around with the idea of a more interactive/eco-system type way of distributing points that drives engagement? Like, maybe commenting can increase the points you get or something like that? In theory, it might set up an engagement loop where users comment on posts to get more points to spread out or dump on their favorites. I have no idea if it's actually viable, though, or if it could throw something off-balance. Either way, I like the overall site idea.