Auto-play video adds in FB
This holiday season and moving forward, when eligible, video mobile app ads will play automatically in News Feed
Earlier this year FB already announced they where going to auto-play video adds 1.
I am sure many people will hate this. As far as I understand with "eligible" they mean that auto-play isn`t turned off in your settings. Namely the default setting is on and you have to do it for every device. For Chrome it is chrome://settings/content look for "Plug-ins" and check "Click to play". For Android App: go to the hamburger on the right and scroll down to "App Settings" and tap on "Video Auto-play"
1 https://www.facebook.com/business/news/video-ads-on-facebook?
Drive Mobile App Awareness and Installs Over The Holidays