Facebook locked me out of my account because MediaCom changed my IP address ages ago. I did not provide my cellphone number so there is no way to get back in.
But now I am receiving Spam from Facebook and R & R Web Design LLC. Here is the senders address:
"R & R Web Design LLC <notification+kr4m2yxs4e5a(AT)facebookmail.com>; " -- edited so it is not a live link.
ETA: It doesn't even go to an email address I use often - this goes all the way back to August and continues frequently.