Facebook’s latest feature of video calling powered by Skype, which was opened and was followed by the introduction of ‘Hangout’, video chat by Google in Google+, is not carried for all Operating Systems.

The video calling supports Firefox, Chrome, Safari, and Internet Explorer on Windows, Mac and Linux OS but it doesn’t work in the pre-released edition of Mac OS X. Facebook video calling is blocked on Mac OS X Lion browsers. You will observe the video call button go grey with notification saying, “Not supported in this browser or OS version” if you try to make a video call . . . → Read More: How to Enable Facebook Video Calling on Mac OS X Lion Browsers