Yahoo has purchased the micro-blogging forum Tumblr for $1.1 billion. It is thought Tumblr will bring millions of young users under the Yahoo umbrella. Tumbler’s front page says it owns 108.9 million blogs. as CEO Marissa Mayer has put a casual stamp on the transaction which Yahoo says “per the agreement and our promise not to screw it up, Tumblr will be independently operated as a separate business” with David Karp staying on as CEO. Charming
