What is it that compels you to post a response to a particular thread? Content? Other member's responses? Subject matter you care about? Your amount of knowledge on the subject? Comfort level with the people participating? Fluffiness? What else is/isn't going on in your life at the moment? Length of thread?
What makes you decide to stay away from posting on a particular thread?
What areas of the forum are your favourite/least favourite and why?