Yahoo has agreed a deal to buy New York-based blogging service Tumblr for $1.1bn (�725m; 857m euros) in cash. Yahoo's chief executive Marissa Mayer said that as part of its promise "not to screw it up", Tumblr would operate independently.
Yahoo buys start-up Tumblr for $1.1bn
Yahoo to acquire Tumblr for $1.1 billion cash
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