You must be kidding? Last I looked nobody could post on RB. And those that tried got suspended. Speaking of being suspended, weren't you? Oh yes, I remember. You said you got kicked off the SUGG board and now post about stocks (hardeeharhar).
To answer your question, I lurked on S.I. for years, then came to iHub where I finally started posting. Still don't know whether that was a wise decision or not. As to RB and the Yahooligans, never understood those places. Funny thing is how some of the boards are on both RB and iHub. Then people cross-reference, or better yet, post the same articles to the same people. Quite something, but I do get a bang out of it.
AK