In a world where “man boobs” are allowed to flop freely at football games, the strict scrutiny of photos of breastfeeding mothers reflects a double standard that has riled many Facebook users. By curbing the posting of such content — the implication being that the nursing mother’s bare breast could possibly be construed as “obscene” — Facebook has exposed itself to a public relations nightmare. The social network is under fire for removing photos of breastfeeding babies from some of its member pages.