Spotted someone I vaguely recognised in the suggested friends list. Clicked on them, and realised it was one of the young lads who I'd refused drink in the shop because he had no ID. Checking his birth-date I saw I'd been right to refuse him. Then I spent the next half an hour going through his friends list for other teenagers who're always in the shop. Making a mental list of which ones weren't old enough to buy drink. So I'd be ready for any fake ID or bullshit. I am the ultimate shop employee