Reports that Google (GOOG.O) has held takeover talks with Twitter that value the microblogging site at as much as $10 billion are "just a rumour", Chief Executive Dick Costolo said on Monday. Asked at the Mobile World Congress fair in Barcelona whether Google could afford a $10 billion acquisition, Costolo replied: "I don't know where these things come from. It's just a rumour." He declined comment on a follow-up question on Facebook, which has also been reported to have held low-level takeover talks with Twitter. Twitter, which had 175 million users as of September, raised $200 million in a December financing round that valued it at $3.7 billion. (Reporting by Georgina Prodhan; Editing by Will Waterman)
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