How to Turn Off Auto play videos On face book
You can adjust the Facebook app's auto-play settings to On, Wi-Fi only or Off.
To adjust the auto-play settings on your Mobile:
1. Open the Facebook app
2. Tap Menu Icon
3. Scroll down and tap App Settings
4. Tap Video Auto-play
5. Choose an option
Note: If you don't see the Video Auto-play settings on your Android phone, log out of the Facebook app. When you log back into Facebook, Video Auto-play should be visible in App Settings.