I admit the same. Though I'm a part of 5 forums and forget to post in some a lot. Like one I haven't posted in for about a month. XD I also admit that one of the reasons I made the new Movie Night thread is because I needed something to slap some sense into me and get me to post more here.
That's why I have a very strict "No more than two forums at a time" rule for myself. Though since HoRP shutdown and I got pissed off at Fallout 3 and vented my rage on NMA this has been the only forum I've been on in over a year.
I mean, I admit I have a "No more than two forums at a time" rule.