Adam knows about Interference, Bono knows about PLEBA "scary girls."
Larry wouldn't bother I imagine, though he may have heard about, or seen for himself, what some fans said, after the ticket fiasco, after reading the email that was sent from him.
Edge, he probably does, since he's the computer guy in the band.
Wouldn't put it past them if they had people from their organisation to see what's going on at the most well known U2 sites.
Bono did say in a recent interview to "check the internet" saying that U2 fans can be brutal.