Notifications are updates about activity on Facebook. You can't turn off notifications entirely, but you can go to your notifications settings to change what you're notified about and how you're notified.Notifications are updates about activity on Facebook. You can't turn off notifications entirely, but you can go to your notifications settings to change what you're notified about and how you're notified.Notifications are updates about activity on Facebook. You can't turn off notifications entirely, but you can go to your notifications settings to change what you're notified about and how you're notified.Notifications are updates about activity on Facebook. You can't turn off notifications entirely, but you can go to your notifications settings to change what you're notified about and how you're notified.