Facebook launched auto-playing video ads recently on desktops and mobile devices. There is a way to turn off the videos from auto-playing. Certain limitations are imposed with video ads and you cannot turn them off completely. But here is what you can do:
Desktop: Go to Facebook, click the drop-down menu in the upper right-hand corner. Go to Settings > Videos. Where it says “Auto-Play Video,” click on the “On” box and switch it to “Off.”
Android: Open the Facebook app, click “App Settings” on the left sidebar. Check the box on “Auto-Play Videos on WiFi Only.”
iOS: Open “Settings” from the Facebook iOS app. Tap on the Settings option and under the “Video” section, you will see the “Auto-Play on Wi-Fi Only” option.