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Mohamed Magdy , System Administrator & Owner , ModServ, LLC.
"Unfortunately, Facebook does not support video calling on Ubuntu yet, as explained on the Facebook Help Center. They haven't developed their plugin yet.
However, video calling (popularly known as Hangouts) works on Google+, for example (after installing a plugin)."
http://askubuntu.com/questions/96668/how-can-i-do-facebook-video-calls