Android users
Facebook app
1. Tap 3 horizontal lines on the right top corner.
2. Go to Privacy and settings
3. Setings
4. Media and Contacts
5. Autoplay
6. Never autoplay videos

Youtube app
1. Tap profile
2. Settings
3. General
4. Muted olaybacks in feeds
5. Off

IOS users
Facebook app
1. Tap 3 horizontal lines on the right down corner.
2. Go to Privacy and settings
3. Setings
4. Videoa and pbotos under Media and Contacts
5. Autoplay
6. Never autoplay videos

Youtube app
1. Tap profile
2. Settings
3. Muted playback & previews feeds
4. Off