I'm pretty sure there was a time when I joined (over a decade ago now) that Jonny was occasionally posting... well, i doubt he is now or if he is, he is keeping his distant if he's lurking in the First watch/rewatch thread
But yes Stuart BB2 was a member on both here and DS i believe, Jonty posts every now and then in both forums i think, a few from BB10 as mentioned, Marcus even called out a poster on DS during the BB10 final calling him an idiot, and then Cameron a month or so ago from the latest series.