http://wikiless.i2p/wiki/History_of_videotelephony?lang=en
The widespread availability of Internet access , the exponential increase in processing power of modern CPUs, increasingly efficient video codecs , and the introduction of cheap webcams and large-screen Internet-connected video-capable cameraphones such as the iPhone in 2007 led to a virtuous spiral which allowed the integration of video calling as a universal feature of modern mobile phones, laptop and desktop computers.