iOS
To adjust your mobile push notifications on your iPhone or iPad:
Tap
Tap Notifications > Facebook
Tap
Allow Notifications to turn on notifications from Facebook.
Tap
Allow Notifications to turn off notifications from Facebook.
Also Read – Basic Facebook Notification Settings
To adjust your mobile push notifications on your Android device (OS 6.0+):
Go to your device settings.
1. Tap Applications > Application manager > Facebook > Notifications.
2. Turn on or off notifications from Facebook.
3. To adjust your mobile push notifications in your Facebook settings:
4. Tap Notification Settings