What's dangerous about this? Just pic stealing, like any other kind of pic stealing across the web, from selfies to memes to legitimate art/photography. It's pretty fucking stupid and annoying, and I can imagine it might cause some distress, but there's no reason to panic like "OMG THEY GONNA COME STEAL MY CHYLD!" Bitch if they may have that good of an idea of where you live based on Facebook alone, that's what you get for putting too much IRL personal info on the web!