The New Yorker's Robert Mankoff surmised that the drawing got the boot in the first place because of "female nipple bulges," which the social network's policy (posted here, by Gawker) does not allow. "Male nipples are ok," however, which led Mankoff to conclude the following from what he calls nipplegate:
However, both pairs of nipple renderings above are fine by Facebook's unofficial standards, as The New York Times's Miguel Helf explained during a similar incident in February of 2011. "While the company bans nude photographs, its representatives say the company has an unwritten policy that allows drawings or sculptures of nudes," he wrote.
Though the company has taken down art before, it doesn't sound like the company has interests in a war against drawn (or painted on) nips. When it flagged a nude self-portrait last February, it also explained it as a misunderstanding. "In this case, we congratulate the artist on his lifelike portrayal that, frankly, fooled our reviewers. Each member of our investigations team reviews thousands of pieces of reported content every day and, of course, we occasionally make a mistake," Facebook spokesperson Simon Axten told Helf. Some offended reader must have reported the New Yorker cartoon as offensive and with lifelike nipples like those, who can blame the anonymous reviewer for mistaking it as real.