Using Tango Video Calls besides Facetime on iPad 2

I have an iPad 2 and would like to video chat with friends who don't have an iPad/iPhone to do Facetime. They have computer with a camera but don't know much either. Can I use the camera to video chat using other chat clients besides Facetime on iPad 2?Tango Video Calls is the best app so far, because it allows you to chat without WiFi network. Tango can also be used on new phones that have two