How do I remove the time stamp next to my mobile icon ?

 

 

First Way...

On iPhone:
1.Deleted Facebook Messenger, why I had both idk
Settings>Privacy>Facebook>Switch to off

On Facebook Mobile App:
1.Privacy Settings>Notifications>Mobile Push>Uncheck Messages
2. Privacy Settings>Apps>Theres a list of apps you allow to share and i deleted them all.
3.Privacy Settings>Apps>Apps Other Use>Unchecked all but Birthday, Hometown, Current City

I then restarted my phone and tested it. I ask several people, some I havent chatted with in a long time and others I chat with frequently or often. Here's what I got, I was messaging them using the chat bar and not the Message icon in top middle of home screen....

Second Way...

Change your password and choose to logoff all devices.. job done :)