Twitter added a total of four million new users last quarter, a number that seems surprisingly low.
During the company's earnings call, CFO Anthony Noto provided an excuse for its lack of growth: An "unforeseen bug" in Twitter's integration with iOS 8, Apple's mobile software update that launched in September. This "bug" caused Twitter to lose four million users, he added, or half of the company's actual growth.
How exactly does that work?
Well, one million of those users were people who do...