Brooke, I believe that I can answer your first question. One of my uncles did that about a month ago. He's about as computer illiterate as they come, and just did it. Then, he had all sorts of problems. I can't remember exactly what they were, but I believe that Windows would boot up, but he couldn't get a connection(he has wifi and a dsl connection), and he didn't have any icons showing up.
Luckily, Windows offered a " free 30 day trial". If you weren't pleased, you could restore your old version of Windows. Between his brother and me, we managed to get it back for him after a few days of work. I honestly wouldn't recommend doing the free upgrade. I don't know how legitimate it is. If you wanted to buy Windows 10, that's different, but free stuff usually doesn't have everything that the regular version has. If you're happy with whatever OS (operating system) you have now, I suggest that you stick to it. I'm still running Windows Vista!
Your second question, I'm not sure about. I've never heard of something like that happening. I'd suggest looking at your Facebook's settings and see if it has an option like that.