[bbc] Google, the world's most popular search engine, has agreed a deal to buy the mobile advertising firm AdMob.
It is paying $750m (£449m) in stock for the firm in a bid to take advantage of opportunities in the booming market for mobile devices.
AdMob specialises in selling adverts displayed on small screens - for example the iPhone or the Blackberry.
Google said mobile advertising had "enormous potential" and praised AdMob's "exceptional progress".
Google snaps up mobile ad company