Google to buy mobile ad company AdMob

Google plans to buy mobile advertising provider AdMob for $750 million stock. AdMob is a leader in mobile advertising and already serves ads for some applications running on Google's Android mobile operating system. The deal fills a hole for Google, which has mainly focused on mobile search ads, it said on Web pages that it put up to offer further details about the acquisition. AdMob has largely focused on display ads and in-application ads. The acquisition indicates how serious Google is about mobile and about display advertising.