How to Activate Video Chat:
To activate video chat on Facebook, visit http://facebook.com/videocalling and click Get Started. Here you need to download a simple application and install it. You can do that by clicking Setup.

Once you are done with this one time setup, you will see a big sidebar containing the person you mostly interact with – added with a video camera icon, simply click on it to start the video conversation. But note that the person you are trying to call should also go through the above mentioned procedure just once.

Whenever someone tries to call you, you will hear a bell first and then notification will come to accept or reject the video call.

Another important feature that Facebook has integrated is, send video messages. So if someone you are trying to call is unavailable, simply record your message and send it to other person as a video.

Call your friends right from Facebook
Just click the call button at the top of your friend’s profile or chat window — no need to launch new software. No answer? Leave a video message.