Yahoo has completed its $1.1 billion acquisition of online blogging forum Tumblr.

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Yahoo has completed its $1.1 billion acquisition of online blogging forum Tumblr.

The move represents Yahoo CEO Marissa Mayer’s boldest move since she left Google a little less than a year ago to lead Yahoo’s comeback.

It also marks Yahoo’s most expensive acquisition since the Sunnyvale, Calif., company bought online search engine Overture for $1.3 billion 10 years ago.

Mayer is betting that Tumblr, a six-year-old service started by high school dropout David Karp, will help Yahoo bring in more traffic and advertisers on smartphones and tablets.

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Under the terms originally announced in May, Tumblr will remain independently operated and Karp will stay CEO.

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