Apple’s introduction of the iPhone 4 in mid-2010 included a major new feature dubbed FaceTime, a one-on-one video calling feature that the company promised would be inside tens of millions of devices by year’s end. Although the concept of video calling on mobile phones was not new, Apple made the feature accessible by requiring virtually no user set-up, and appealing by offering smooth 640x480-resolution video that was more lifelike than…