Facebook is building an as-yet-unreleased Facebook Messenger app for Mac desktop that would help Apple users to instantly access it straight from the dock, a media report said.

Instead of getting buried in one of many web browser tabs that users have to switch to so they can text friends, the dedicated Messenger desktop app would be instantly accessible from the dock present on desktop, Tech Crunch reported on Saturday.

The news portal said it has obtained photographic evidence and an eyewitness report that Facebook employees are working on Facebook Messenger For Mac.

According to the eyewitness account and the photo, the app used by the employee included the Messenger logo as the icon in the app dock, and was named Messenger in the menu bar.

In the photo, it can be seen that the employee was working on app that includes a navigation tab bar in the bottom left. It matches the tab bar options in official Messenger for iOS mobile app, including "Recent, Groups, People, and Settings" menu.

The report said, the unofficial versions lack this tab bar. Sources also confirmed that the employee was logged into Facebook's internal portals further confirming they were on an official Messenger For Mac app that's not available to the public. Meanwhile, Facebook said, "We do not comment on rumour or speculation."