You've probably noticed it, if you have a Windows Live account:

Spammers are abusing the network by sending connection requests like this:
"Join {name}'s network on Windows Live"

and the body of the message includes a short promotional message - sometimes for male enhancement products, other times it's a woman who wants to show me her sexy undies.

Thanks for the offers, but I'll pass.

These kinds of spam invitations have always happened once in a while, but the recent flood of 'em indicates that someone left a door ajar...