Check out a utility for directly messaging on Facebook without accessing the website. Place a standalone Messenger client on the menu bar and use your authentication data for user verification. Send and receive messages, browse and track multiple conversations, etc.
Downloading Messenger for Desktop 3.0.18 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. The software lies within Communication Tools, more precisely Texting & Video calls. This free Mac application was originally developed by MFD LABS LTD. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
A simple & beautiful app for Facebook Messenger. Chat without distractions on any OS.
You may want to check out more Mac applications, such as Desktop Reporting, JBuddy Messenger or Messenger for VK, which might be related to Messenger for Desktop.
Instant messaging
Instant messaging