Ever annoyed by auto video play feature on Facebook? It’s definitely awesome feature for many people but it’s not for someone like me. Let’s learn how to disable it so you can manually play any time you want.
Now go to your Facebook on your iPhone then
Tap “More” icon 
on the bottom right
*This is tutorial for iPhone users
Tap “Settings” 
Tap “Account Settings“
Tap “Videos and Photos” 
Tap “On mobile Data + WiFi” in Auto-play
On Mobile Data and WiFi Connections is selected as default which means whether you want or not, it will play every videos you see automatically. It often causes an excess data usage depends on your Facebook use.
If you worry about it or just don’t like it then just simply select
“Never Auto-play Videos“
Well done!
*This does not mean you will not watch any videos on Facebook. You still can simply play the videos that catch your eyes manually.