I.e. what Facebook does if you don't log in for long enough. Two days ago I got a pair of messages to the same address with links to completely bypass login and verbiage about how they'd seen I was having trouble logging in followed an sms message with the same to a phone number they're not supposed to be using. It looks a lot like phishing, but it comes out of Facebook's servers and they've done it to me before.
I'm not the poster you're replying to, but: Facebook collects asks for your phone number for security/account recovery reasons, but then turns around and uses it to market to you.
