* AT&T will sell HTC-made "Home" exclusively, price $100 * Facebook takes battle for ad revenue, user times to Google * Facebook's shares climb, Google's fall By Gerry Shih MENLO PARK, Calif., April 4 (Reuters) - Facebook Inc on Thursday unveiled its most ambitious attempt yet to enter mobile computing without a phone of its own, introducing a new app that replaces the home screen on some Android smartphones. Called "Home," the new software lets users comprehensively modify Android, the popular mobile operating system developed by Google, to prominently display their Facebook newsfeed and messages on the home screens of a wide range of devices - while hiding other apps. "Why do we need to go...
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