Yahoo's chief financial officer, Ken Goldman, made the claim during a call with analysts, although he did not give firm numbers.
 

Its chief executive Marissa Mayer said Tumblr would operate independently, in a promise "not to screw it up".
 

Tumblr founder David Karp will continue as chief executive officer.
 

The deal values Mr Karp's stake at $275m.
 

The deal is the largest made by Ms Mayer since she took the helm at Yahoo last July, and she described the acquisition as a "unique

opportunity."
 

"On many levels, Tumblr and Yahoo couldn't be more different, but at the same time, they couldn't be more complementary," added Ms Mayer.
 

Mr Karp, 26, who owns 25% of the privately-owned company he co-founded with Marco Arment in 2007, said he was "elated" to have the

support of Yahoo.
 

"Tumblr gets better faster with more resources to draw from," he added. Mr Karp emphasised that neither its aims or team was changing as a

result of Yahoo's purchase.

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