How to Use FaceBook Messenger on Mac OS X via Messages App
Facebook Messenger is a popular means of communicating, but the Mac doesn’t have a dedicated Facebook messaging app like the iPhone or Android does… or does it!?! Indeed, you can use Facebook Messenger to message friends from OS X, and in moments you can set up the Mac Messages app to function as a Facebook Messenger client in OS X.
Using Facebook Messenger from the Mac is really quite simple, but it’s entirely separate from configuring Facebook sharing from the Mac, so if you have done one but not the other, you’d need to complete both to have the full Facebook functions of sharing, posting, and messaging available to you in OS X.