Vine's Editor's Picks are curated content and are therefore displayed at the top of the app, which means a large portion of Vine's users saw the feed containing the inappropriate clip.
Apple originally featured Vine last Friday, shortly after its release, but the Cupertino-based company has now reversed that decision and is no longer promoting Vine via the Editor's Choice section in the App Store.
According to a Twitter spokesperson who spoke to The Verge, the pornographic video was the result of 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 apologize to our users for the error.
Apple was not satisfied with Twitter's apology, but the app did not receive the same treatment as 500px, which was removed from the App Store last week because it allowed users to search for nude photos.
Though Vine has not been kicked off the App Store, Apple has ceased all promotions for the app. In addition to removing Vine from Editor's Choice, the app is no longer listed under the 'New and Noteworthy' section and it is not featured in the social apps category.
The Verge reports that Vine has begun to hide inappropriate content within the app and is now blocking searches for several pornographic terms. Searching for the offending words no longer brings up search results, though inappropriate content can still be accessed when tapping on a tag.