We understand it's difficult for Facebook to police the content of its millions and millions of users.

Yet the company says that, in fact, it does police user posts based on complaints. That's why it's so hard to understand why Facebook, with users as young as 13, would allow videos of beheadings to appear in news feeds.

The company back in May had instituted a ban on such content after complaints about a video of a woman being beheaded, apparently in Mexico. But the company has since changed its stance, saying, “People are sharing this video on Facebook to condemn it. If the video were being celebrated, or the actions in it encouraged, our approach would be different.”

So you just can't appear to be enjoying the video when you post it, never mind the exploitation of the victims in the video.

The social media network already bans hate speech, nudity (including a “fully exposed breast” not involved in nursing a child) and threats of violence.

Facebook's policies also still say it bans content that contains “excessive violence.”

We're not sure we want to know what would be more excessive than a video of a beheading.