The UK has had its fair share of the action, as British start-ups have begun to attract the attention of Silicon Valley's biggest players.
 Last month, a secretive London artificial intelligence start-up, DeepMind, was acquired for £400m by Google – just days before the struggling US gaming firm Zynga shelled out £320m for the Oxford-based games studio NaturalMotion.
 Most people outside the tech world had never heard of these firms – and there are plenty more UK tech firms flying below the radar which could soon be eyeing a million-dollar exit.
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 Zynga may be interested in SpaceApe, which, along with NaturalMotion, could help it crack mobile.
 Google could also be tempted by the firm's work on artificial intelligence.
 SwiftKey It may not sound like much, but this predictive keyboard app is seen as one of the hottest start-ups on the UK technology scene.
 The firm was co-founded by Ben Medlock, who has a PhD from Cambridge in language-based artificial intelligence; the app learns how you speak, suggesting phrases and even whole sentences as you type.
 Who might be interested?