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I HATE IT when videos auto play, specially when viewed on mobile (mobile data charges). Luckily there is a plug-in for everything and thanks to Firefox for Android.
Facebook videos started to play automatically from last year or year before, I really can't remember the particular time. I turned off the "auto-play" feature the very first day. But I vaguely remember that those automatically videos needed a touch to play the sound. I think it would be very much annoying if the videos started to play WITH the sound.