On a night out we (me and a bunch of people) "found" a young Irish lad who had come to Liverpool on a stag weekend. He had got seperated from his mates, no phone, very drunk all he knew was that he "was staying in Dave's".
He was slumped in an alley, city centres aren't safe. One of his mates had put his picture on FB and was linking people whose profiles were open, it was being shared and came up on one if our crowds News Feeds, we got him to the address that they were staying at.
I share missing people, unfortunately a lot of bodies (especially of teen lads) are found in Merseyside and Manchester, the quicker witnesses come forward, the better.
A lot of peole are found, as well.
A lot of pets are, as well, so I don't know why you would object, tbh.
Now my DD's are older teens, I hope that they would be helped, if lost in a city, in the same way.
I think this is a good use of FB. I've known a few elderly confused people that have been tracked down this way.