Yes, that message is really from Facebook. And, yes, it's really malicious.
That's a real post from our friends at KnowBe4 Security. From the post:
Employee Awareness is Ransomware's Greatest Protection
October is National Cyber Security Awareness Month, a great opportunity to strengthen your human firewall in the war against this ransomware epidemic. We love that term, "Human Firewall" - that is [...]