Sorry pornstars, sexting teenagers, and internet creeps, the popular video clip sharing app Vine has announced on their blog that they’re no longer going to allow the posting of explicit sexual videos with their service.

Explained Vine: "We don’t have a problem with explicit sexual content on the Internet –– we just prefer not to be the source of it."

How will they determine what counts as pornography? To help users know, the people at Twitter (who own Vine) have provided a nice little FAQ laying out some of the ground rules. Mostly, though, it boils down to them relying on Supreme Court Justice Potter Stewart’s old legal Maxim: “I know it when I see it.”

Violators will face suspension, and, should they repeatedly post pornography, permanent expulsion from the Vine community.