I tried doing an address search for a relative and a window popped up "behind" my Safari screen for this ad: "Try our Facebook People Search App...Who's Friending You? Find Out>" (there's more text, but you get the idea. The top line of the window says "People Search & Background Check" (where this window says "New Thread in Apple and Macintosh") I have my pop-up blocker enabled and I am afraid to "close" the window using the "red" icon. I have tried force-closing Safari and shutting down my Mac. It seems to go away until I click on the Safari icon and it automatically pops up again. Tried searching for info here and on Apple's support site and found nothing. Any suggestions?