NOTE that Facbook typo sites (Facebok or Faceboook) will play an audio clip saying you have been chosen for a "survey". These surveys ask for personal information, often a cell phone number, so that they can "slam" you with a service you don't want, that is hard to remove from your cell phone bill. And yes, trying to close your browser just causes more fake pop-ups to appear, asking you if you really want to close the browser. Play it safe, do not click on these, just close the browser using Task Manager.
And by the way, what is up with that? Facebook is supposedly the "most popular site on the Internet" and yet they cannot obtain the Facebok and Faceboook domain names under the anti-cybersquatting act? Facebook doesn't seem to have your best interests at heart, do they?