[outages] Crazy amts of spoofing?

Anyone seeing crazy amounts of spoofing that are going out to what looks like address book entries? In other words, not from your client, not from your server, but spoofing an email address that's yours, and going to recipients that look like your address book (e.g., grouped by last name and to people you know). I don't want to point fingers, and I have no evidence of this in any way, but it almost looks like a social network site, that may have access to address book entries, got hit -- and someone is spoofing big time. The other option would be a Mac virus hitting address book entries. Anyone seeing anything this? Neil