In a peculiar behaviour observed all across facebook, it has been seen observed that videos are being auto played by facebook! While it is common knowledge that facebook is trying their best to give tough competition to YouTube in trying to be the go to place when it comes to video viewing, this new tactic seems more of an act of desperation. There are already multiple posts by people saying how they are bugged by this new phenomenon. Hope common sense prevails and facebook hands back the remote in our hands.
Edit : You can turn these auto play videos off. Go to https://www.facebook.com/settings?tab=videos and turn them off.
One of the many videos that kept getting played on the timeline.