Adoption of the newly released iOS 7.1 is at 18 % after 72 hours. This is according to Chitika which measures web traffic in North America.
According to AppleInsider, "for the purposes of the study, Chitika Insights studied tens of millions of U.S. and Canadian online ad impressions originating from iOS devices from Mar. 9 through Mar. 12." iOS 7.1 brought a slew of updates as the biggest revision to the Apple mobile OS since it launched six-months ago. The big bonus for users of older devices like the iPhone 4 is that overall performance has actually improved thanks to iOS 7.1.