Chitika, an online advertising network, has released a study indicating that iPhone users are least likely of all mobile users to click through mobile adds. The study of mobile Internet usage vs. non-mobile usage covered 92 million samples, with roughly 1.3 million click-throughs from mobile users. It showed that non-mobile users clicked through at a .83-percent rate, while mobile users were generally 50 percent less likely to click on an ad as opposed to non-mobile Internet users.