“Google’s back on the acquisition front, spending $750 million in stock Monday to acquire mobile display ad company AdMob. AdMob is perhaps best known for serving display ads on iPhones, but it also recently started a business unit focused on ads for Android phones. The start-up would appear to fit well into Google’s advertising business model, giving Google a leg up in the still-small but fast-growing world of mobile advertising.”
Given AdMob’s already extensive usage on Android, I naively assumed that AdMob was already one of Google’s subsidiaries.
So this purchase seems a very logical move on Googles part.