Wow tee, that's scary! I would be cautious too, you don't know right now how much of your information they've stolen. ........... so yea, games and FB too depending on what he's doing there. Some of the FB games carry viruses, and if you "like" something with a virus you get it too. I made the mistake last year of commenting on the wrong thing on FB last year, got a trojan virus!
Nova they can't keep your car. They can make you sign a statement that it's unsafe, but that's it. If they are trying to do more i'd shop around for a different mechanic! I had one do it to me when i was staying in FL. Tried to keep my car! Quoted me $500 of work! Had to go get DH, boy was he a mountain of fury that day! They were liars, too, we found out after he inspected it himself. Only thing wrong with my brakes was a piece wasn't setting in there right, didn't even need pads!
Also, i was pricing the computer thingy's online, they run around 100-200, not that you have it lying around but if they are quoting you at 100 like they are me to put it on a computer................. if you get the right one it will reset the trouble lights too.