A couple days ago I posted about "crap apps": entertaining and completely useless apps A couple days ago I posted about "crap apps": entertaining and completely useless apps that in some cases make a lot more money for the developer than serious apps. Now the Wall Street Journal has an article on what might be called "ad apps": apps whose main purpose is to promote a product. The WSJ tells the story of iBurger, which promotes a Hardee's burger. If you make a munching noise into your microphone, bites are taken out of the onscreen burger. By far the most popular ad app is Zippo, a cigarette lighter that opens with a flick of your wrist and lights with a turn of your thumb. It has some 120,000 ratings in the app store. No doubt we'll be seeing a lot more of these apps.