'No questions were asked and the post is down. Imagine our surprise.'
The test follows a series of protests over Facebook's policy on pictures of women breast-feeding.
Facebook has banned mothers from posting photos of themselves breastfeeding their children. The decision to remove the 'inappropriate' photos has caused protests by women's groups.
The social networking site, which recently announced its one billionth sign-up, claimed that those images which show too much breast violate its terms and conditions.
It has warned that users who continue to post photos which it deems inappropriate could lose their access to the site.
NO SEX, BUT CRUSHED HEADS ARE OK: FACEBOOK'S MODERATION POLICIES
The latest Facebook moderation gaffe highlights the social network's zealous but inconsistent efforts to eliminate so-called 'graphic content' from the site.
Breastfeeding mothers have protested against the site for blocking photos of them feeding their babies because they are 'inappropriate', while many other graphic pictures remain uncensored.
More recently there was outrage at Facebook's moderators for blocking pictures of the Israeli bombardment of Gaza while similar pictures showing the effect of Hamas rocket attacks remained available.