First spotted by The Next Web, it seems like the feature is slowly rolling out to the majority of users. In our informal poll, four out of five people were already seeing the button in their feed. Facebook has been steadily improving its video options in an effort to muscle in on YouTube's lucrative business of placing ads on user videos. If pop-ups gets more users watching more videos for more time, that can only be a good thing when it comes to selling marketing space to potential advertisers.