It is a piece of bloated app that adds all your FB friends to your messenger friend list automatically and constantly spams you to contact them on anniversaries etc. I deleted it the same day I downloaded it.
that's weird, i never get prompted to contact anyone except for the default thread that opens when you have a new friend, which admittedly i don't like
I wrote a custom ARM assembler that generate prolog that uses genetic programming techniques to optimize the interface. I've found the best interface to be my set of 8 multi-colored LEDs driven by a custom build arduino system that talks serial. Unfortunately I have to use a usb-serial adapter these days, and then a usb-c-to-usb-a adapter. My dongles have dongles.
Not sure if its relevant for messenger or not, but I wouldn't be surprised if messenger was overly huge for the task its performing.