Facebook pushed out an update to its iOS application that enables auto-play for videos embedded in newsfeed posts. The videos will play silently until the user taps the screen to turn on sound. The update is free.
Just my paranoid opinion. Looks like they're prepping users for video ads. I know a lot of people are annoyed by this feature already. But like anything Facebook, they'll soon forget, quit bitching, and get used to it. It won't be a big deal once they roll out the video ads, especially if they don't have sound either. Very sneaky. It seems the rumors are about to become true. Get adblockers now if you already don't.