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Messenger for Desktop (Mac OS X) solves this problem, as you can chat in full screen or resize the window to suit your needs. This option is particularly useful if you're chatting at work and want to do it discreetly. Messenger for Desktop (Mac OS X) is an unofficial client that allows you to use Facebook’s messaging service on your PC without having to be connected to the social network (although you have to login via the client, of course). Messenger for Desktop (Mac OS X) is a lightweight and useful piece of software you can use to talk to your Facebook acquaintances and friends directly from your computer's desktop, therefore, without the need for a web browser. It's an unofficial client, so it's not affiliated with the social network.

When you open and login to Messenger for Desktop (Mac OS X), it imports all the options from your Facebook profile so you can start chatting immediately. The only option you might need to configure is whether to turn message notifications on or off.