no, it's not like I joined them all in one day I work for a company that has 70 forums, and I touch every one several times a month and then the other 20 or so, are vb help sites, and webmaster forums like DP
I have my own forum, then I also participate in at least 5 more. I find it good way of getting to know what others are thinking on recent stuffs in the webmaster world.