I'm mostly in the Cat Lounge. I'll sometimes browse the other forums if I'm looking for an answer to something or if I need to post something specific, but generally don't reply unless I think I have something constructive to offer. I try to go to the Rainbow Bridge forum as much as possible to offer my condolences, but have a difficult time being there as it's too heartbreaking for me, especially since losing my precious Maverick.
I usually try to pop into the New Cats On the Block forum to say hi to the newbies, or to buy them a "welcome to TCS" gift. I rarely ever visit the IMO forum - nor the PL - even though I'm a paying member and have that privilege.
ETA: And sometimes, I just don't know what to say, so I don't say anything at all.
ETA: And sometimes, I just don't know what to say, so I don't say anything at all.