Emil Protalinski, writing for The Next Web:
Facebook today introduced 15-second video ads, which will start playing without sound as they appear on screen and stop if you scroll past. If you tap the video, it will expand into a full-screen view with sound. The company says users can expect to start seeing these new ads “over the next few months.”
Facebook is not the first to bring auto-play videos to mobile devices — both Instagram and Vine did the same last year. However, I don’t like this trend where companies automatically download videos over a cellular data connection, eating through our monthly data caps. All of the aforementioned apps give options to disable auto-play when not on Wi-Fi, but that setting should be what we have to opt-out of, not opt-in to.
—Friday, 14 March 2014