Posting pornographic videos will now get users banned from the video-sharing network Vine.
The Twitter-owned site updated its rules and terms of service on Friday to prohibit explicit sexual content.
"For more than 99 per cent of our users, this doesn't really change anything," the company says in a blog post.
"For the rest: we don't have a problem with explicit sexual content on the internet - we just prefer not to be the source of it."
Banned content includes sex acts and sexually provocative nudity, even where it is cartoon form. But nudity that is educational, artistic, or part of a documentary will be allowed.
Users who violate the new policy face suspension pending the removal of banned videos, and severe or repeated violation may result in a permanent ban, Vine says.
A "report" button allows users to flag potentially inappropriate videos.
Vine is a mobile app that enables users to share short-looping video clips with a maximum length of seven seconds.
