Whenever I log in to Tapastic I always go the forums to see the new topics, discussions and mebbe some old topics that are hidden somewhere in the depths.
I think the forums are really important to any site's community, not just from a social perspective, there are peeps that come here and look at the forums as a way to do some catharsis, they tell us a bad experience, or if they're having a bad day, and there are always peeps willing to read, and offer advices, for me, that's pretty amazing.
Forums became not just a way to chat with creators, but a platform to offer help (art, life, softwares, etc), have fun (there are pretty good game topics here), relieve some stress (peeps doing catharsis), properly advertise, and many things more.
So go Forums go!