Say you're on a board like ET, a new user registers and posts a vague tip to puchase cuz stock. You ignore it only for the stock to make big gains after reporting blow-out earnings or some other news event. Next few times the user posts, big moves follow the stock. The user then disappears and never posts again. Would you act on the advice of an anonymous poster that has a proven albeit short track record. Would this be insider trading if it's later proven that the anonymous poster was sharing non-public information? Would anyone care?