Facebook introduces changes to video ads

Facebook is one of the sites with most viewed videos, but this is kind of controversial, as a person does not have to click the video for it to play.
Innovating in the video ad arena, Facebook announced that it will let advertisers pay only for video ads if it appeared 100% on a person's screen. This is definitely a move in favor of the advertisers as it will remove the uncertainty if the was played just because it is the way Facebook is considered or the person was actually interested.