I would say a combination of people with delicate sensibilities. Bring it up with in conversation with friends(not just the boys but the girls too, your mother and female relitives as well). Also by forcing facebook they are at minimum mildly annoying your averedge spammers(not the expert spammers).

I agree about the college age girl. The upcoming generation might be called the "voyeur" generation posting everything with out shame but the curve of women steeply drops off as you get older.