Tumblr's Road to $1.1B: Why Did David Karp Sell Now?

May 20 (Bloomberg) -- Yahoo is buying blogging network Tumblr for about $1.1 billion as CEO Marissa Mayer seeks to lure users and advertisers with her priciest acquisition to date. Bloomberg's Jon Erlichman speaks with Emily Chang on Bloomberg Television's "Bloomberg West." (Source: Bloomberg) -- For more "Bloomberg West" videos: http://bloom.bg/LIZpfr -- Subscribe to Bloomberg on YouTube:    / bloomberg