Toyhouse is so fun to me. It makes me happy several times!!
It's the social I am most active on, because it has a LOT of stuff to do!! I love hanging out in the forums (especially the category this thread is in right now) and just talk about random stuff. I've met really nice people and even rp'd a little once!
I also love how this is basically a site for sharing your characters but with a LOT of customization and possibilities!!!! it makes me kinda sad that the mods are being kinda inactive lately