When looking around, one can see, that the video format is starting to take over all forms of communication. Almost all messaging programs in the world allow videofeeds, you can also find that feature on most web based services. Just audio isn't enough anymore for communicating with people over long distances.

I've made some videocalls myself during the last few years, mostly to my friends. Back then we used instant messaging programs like MSN Messenger. Now there are countless versions of different programs of this kind. Most of them (at least the more popular ones) fully support videofeeds. The 3G networks around the world allow people to make videocalls with their phones, too. It's quite easy as most phones today have a built-in camera and support making those calls.

I can say without a doubt that although audio-only forms of communication are the most used in the world today, in ten years or so, video will take over.