Emphathy is an amazing chat client in GNU/Linux.It has all the facilities of video chatting and audio call facility.The interesting feature i noted is , it has a desktop sharing option. If u have broadband internet ,u can try it .That is sharing your desktop with your friend’s desktop. Its an amazing feature. Even in Windows, there are desktop sharing options, but this is actually beautiful. GNU/Linux is simple, humble and a beautiful OS..
Desktop Sharing in Emphathy chat client in GNU/Linux