"As virtually every new video or photo-sharing service has shown us since the dawn of the Internet, from Flickr to ChatRoulette, it's very difficult to keep these sites or apps G-rated. So the companies either learn how to police it well, like Flickr does, or they wither and die, as ChatRoulette did," wrote The Atlantic Wire's Adam Clark Estes in a post titled "Vine has a porn problem because, of course it does."

In a statement to CNN, Twitter noted what had already become apparent on the app -- that users can report videos they deem inappropriate.

"Videos that have been reported as inappropriate have a warning message that a viewer must click through before viewing the video," a spokesperson said in the statement. Reported videos that are determined to violate Vine guidelines will be removed from the site and the user account that posted them may be terminated, according to the statement.

Vine's terms of service ban illegal activity, harassment or abuse and behavior such as impersonating another user or violating trademark and copyright.