IDG News Service - Mobile users of Google's search and YouTube service will soon see more targeted ads that take them straight to the installation pages for advertisers' mobile apps. Google on Tuesday announced its rollout of targeted mobile app install ads, a growing form of advertising that is a lucrative revenue source for Facebook. Twitter just announced its own program last week. Businesses can already promote their apps via Google, but app install ads offer a direct way in: Users see a button marked "install" right next to the ad, or "open," if they already have the app but maybe haven't used it in a while. The ads will roll out over the next few months on search and YouTube, as well as across the company's network, Google said. The technology also includes deep-linking. So if you already have, say, the HotelTonight app on your smartphone, and you search for "hotels in New York" on Google, you might see an ad for the specific...