The launch of Twitter's video-sharing service Vine has brought with it another look at pornography on Apple's tightly-controlled iOS platform, and that scrutiny may be about to increase — the current top Editor's Pick when you open the Vine app is a pornographic clip. Since Editor's Picks are inserted into every Vine user's main feed, it seems this video is being pushed out to a huge number of Vine users. The video is hidden behind a NSFW filter and doesn't play automatically, but nonetheless it seems some users aren't exactly happy with having porn automatically inserted into their feed. We're reaching out to Twitter now to find out exactly how this happened, but it's clear that Apple will soon have to respond — if the company can justify pulling highly-regarded photo app 500px from the store due to pornographic concerns, Vine should represent a real issue for the company's porn police force.

Update: Not surprisingly, the offending video has been removed from the Editor's Pick section, and no longer shows up at the top of users' feeds. We're still waiting to hear from Twitter about the issue and will update this post with any new information we receive.

Update 2: A Twitter spokesperson has responded to our inquiry about this morning's pornographic Vine with the following statement: "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." From the sound of things, an algorithmic failure wasn't to blame here — someone actually pushed this video out to the Editor's Pick section.