Twitter Inc. is showing early signs of success selling advertising on mobile devices, something other social media platforms have struggled with. Twitter is now generating the majority of its revenue from ads shown to its users on mobile gadgets. It seems people who see Twitter ads on their phones are more likely to click or engage with it in some way. A number of businesses, including P.F. Chang's, are benefitting from Twitter's successful mobile advertising efforts. In the first four days roughly 1 million people clicked, recirculated or otherwise interacted with a Twitter ad created by P.F. Chang's and the majority of those people engaged with the ad via mobile device. Mobile advertising is on the rise and Twitter's potential growth in mobile ads seems exponential.