2cents: It’s true for me. I don’t post on matzav, on VIN, or any of those.
(I should also note, that this is the only site on which I use the handle Popa bar abba. I heard some nut was pretending to be me somewhere, about a month ago. I didn’t go there to say it wasn’t, because I don’t need to disavow every nut who uses my handle elsewhere.)