Twitter's newly launched six-second video app, Vine is under scrutiny for featuring inappropriate content in the app. Several users seem to be employing the app to showcase pornographic video clips.

The app allows users to upload six second video clips and marks them using hash tags, similar to Twitter. However, a simple search in Vine using hashtag #sex or #porn throws up thousands of prurient videos, irking several of its regular users.

In a related development, Twitter apologized for a pornographic video appearing in the Editor's Picks section of Vine -where users can browse some of the top Vine videos.

Twitter's spokesperson said the video had reached the Editor's Picks section due to a "human error."

"A human error resulted in a video with adult content becoming one of the videos in Editor's Picks, and upon realizing this mistake we removed the video immediately. We apologies to our users for the error."

Previously, TechCrunch described the app as Twitter's response to Instagram - a popular photo-sharing app that was purchased by Facebook for $1 billion. Like Instagram, Vine integrates with Twitter to embed videos directly in tweets and users can follow other Vine users.

The app did not take long time to gain momentum, for within a day of its release Jan.24, Vine was featured in the Apple's App Store. However, with the pornographic videos surfacing in its platform, Apple may pull out the app like the photo-sharing app 500px, which was pulled out from the store owing to similar reasons.

Citing customer complaints as the top reason for pulling down the 500px app, Apple in a statement published in TechCrunch said: "The app was removed from the store for featuring pornographic images and material, which is a clear violation of Apple's guidelines. We also received customer complaints about possible child pornography. We have asked the developer to put safeguards in place to prevent pornographic images and material in their app."

The Cupertino tech giant is yet to indicate its course of action with Vine. However, Twitter has responded issuing another statement that urges users to flag videos they find inappropriate.

Reportedly, users can flag videos as inappropriate based on the content (e.g. nudity or violence). And, videos classified as inappropriate will carry a warning message that a viewer must accede to prior to accessing the clip. 

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