Forget the rest … this is the one to get.

This is basically a wrapper for the web based Messenger client, but its the only FB Messenger client Ive found that works 100% out of the box. That makes sense, since it is wrapping the official client into a standalone app. Badge notifications work, photo uploads work, and its a very slick package overall. Works great on my older Mac (OS X 10.8.5), as well as my wifes Yosemite machine.

CocoSugarKat about webMessenger