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[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