So I've been locked out of FB since Noon yesterday. Get a screen that says
"Your Account is Temporarily Locked. Wer've locked your account because someone recently tried to log in from an unfamiliar location. Please help us confirm that it was you who tried to log in"
It wasn't me; I was on FB at the time from my usual location (home PC) and I only ever log on from there, my work PC or my phone. Problem is, that warning screen has a "continue" button that's supposed to take me to the next step but the page is constantly loading and re-loading and the button doesn't work. They also sent me an email with this info and the link in the email leads me to the same unhelpful page.
Some Googling tells me LOTS of people have had this problem at one time or another, and it (eventually) resolves itself but meantime I'm stuck.