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How to disable audio in News Feed videos on Facebook for iPhone
Videos in your Facebook News Feed used to play silently unless you manually turned sound on. The social network recently changed that behavior so videos that previously played silently now play with audio on, with sound fading in and out as you scroll through your News Feed.
In this step-by-step tutorial, we'll tell you about a hidden setting that lets you easily force the mobile Facebook app to autoplay all videos in your News Feed with audio off.