When I get a message on Facebook the Messenger app rings and the notification is disappearing from the lockscreen, and it's very annoying. I reinstalled the app but it didn't fixed the problem. iOS 9.3.1, iPhone 5S
Same with me. Reported it in the hope they will fix it in the next update. In the meantime I've done the delete, hard reset and reinstall. Time will tell if it works! Running iOS 9.3.2