(Telecompaper) Google's YouTube has agreed to buy videogame streaming specialist Twitch for more than USD 1 billion in cash, Variety reported, citing sources familiar with the matter. The deal is expected to be announced imminently. If completed, the acquisition will be the most significant in the history of YouTube, which Google acquired in 2006 for USD 1.65 billion. Both YouTube and Twitch declined to comment but the report added that YouTube is preparing for US regulators to challenge the Twitch deal on anti-competitive issues in the online-video market.