Facebook recently upgraded their chat to start supporting Video calls just like on Google+ however people are experiencing issues activating this on their OS X Lion. The issue is now resolved and all you have to do is to follow the simple guide posted below:
1. Launch Safari on OS X Lion
2. Go to System Preferences and click on advanced and then enable the developer menu.
3. Now click on the new option shown on the menu bar titled “Develop”.
4. Click on User Agent and click on Safari 5.1 – Mac.
For Chrome you have to download the plugin (link provided below) and click on its icon near the address bar and the select Internet Explorer 8.
For Firefox users you have to install the plugin (link provided below) and after installing select Internet Explorer 8.0 from Tools.
The main process is complete and now simply head over to www.facebook.com/videocalling.com and you now have the feature running on Mac OS X Lion as well. If you are a windows user and want to get it on windows or are totally new and heard about the update for Facebook chat for the first time, click here to read more about it.
Download User-Agent Switcher Plugin for Firefox
Download User-Agent Switcher Plugin for Google Chrome
[Via: Best Techie]