We know that the internet is riddled with spam. Every morning when we check our email, there it is, hitting us in the face. Usually we just delete them and keep on going, but some courageous souls go after them, such as the blog titled "inboxrevenge". They have found that a lot of it revolves around "Yahoo groups", and claim that Yahoo is "dragging its feet" in correcting this anomaly. Spammers, though, you can be sure, are here to stay, so the best we can do is continue deleting them.
Link: Acai Berry Spam and Yahoo Groups « Inboxrevenge's Twitt