I upgraded to 8.1 (Single language), since then  I am unable to see the Facebook video calling button.

Facebook videocall button disappeared in each profile.I tried firefox, chrome but all ended up the same.

Please help.

If you first "pin" the Chrome or Firefox to the Taskbar and then right click and choose the first main entry in my example "Google Chrome" from bottom to Top and right click that and choose "Properties"

Next choose under the "Compatibility" tab "Run this program in compatibilty mode for" and choose "Windows 8", close any other windows of the browser and restart it, now login into Facebook and you should have your calling icon when you click on one of your online contacts.

Hi,

Please check this fix:

To activate video calling

https://www.facebook.com/videocallnow/posts/250167428331356

Please Note:  This response contains a reference to a third party World Wide Web site. Microsoft is providing this information as a convenience to you. Microsoft does not control these sites and has not tested any software or information found on these sites; therefore, Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. There are inherent dangers in the use of any software found on the Internet, and Microsoft cautions you to make sure that you completely understand the risk before retrieving any software from the Internet.