I was talking about Angelgate earlier today with an entepeneur (the new spelling) and we were talking about what a difference it makes that we don't know who was there when Mike Arrington walked in on the meetup of angels apparently colluding in an illegal fashion.
Or you could call up all your contacts and say you weren't there. But then they would wonder. I wonder why he felt the need to do that? They'll probably think I was there if I deny it. Better to say nothing.
Now imagine that there are 1000 entrepreneurs in Silicon Valley out looking for money. Suppose you're one of them. You've had meetings with a bunch of angels and you're wondering if the guys you've been meeting with were in the collusion meeting that Mike reported on? No way to know, since TechCrunch didn't say who was there.