Yahoo said Monday it will buy blogging website Tumblr for $1.1 billion cash, in a bold move to make itself more relevant amid the explosion in social media on the Internet.
In the press release announcing the deal, Yahoo said it "promises not to screw it up." It said Tumblr will operate independently as a separate business, perhaps trying to assuage Tumbler users who are concerned that Yahoo would irrevocably alter the blogging site's edgy image.