Yahoo says its $1.1bn (�723m; 857m euros) purchase of blogging platform Tumblr will boost its revenue as soon as 2014. Yahoo's chief financial officer, Ken Goldman, made the claim during a call with analysts, although he did not give firm numbers.
Yahoo vows not to 'screw up' Tumblr
Yahoo on $1.1bn Tumblr acquisition deal: we won't screw it up
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