Notifications are broken as hell. When you tap on notifications  you have to then tap on ""See all notifications"" from the page where it shows you the same old notifications from the last two weeks instead of recent ones. When you have a message in messenger and check it elsewhere  it does not refresh. You have to shut down the app and restart it to clear the notification that you have a message. These are basic UI and functionality issues and are irritating as hell on a daily basis.