Oh man. This looks like such a scam... Give me your contact info and your banking details and I'll send you some cash. And 6 MILLION DOLLARS. I am, after all, a well respected Nigerian Prince!
I just now this morning had a notification in my actual Facebook notifications, leading to an actual facebook.com modal I had never seen anything like, which then linked to facebookuserprivacysettlement.com
So it would seem to be the legit one.