How Tumblr Turned a Book Into a Bestseller

In early 2013 Yahoo purchased social media website Tumblr, and many people thought it was a bold move. The a community of millions add 75 million daily posts about everything from politics to pets. Few people saw Tumblr as a promotional and marketing tool, but the online service turned Zeus Grants Stupid Wishes by Cory O'Brien into a viral sensation and overnight bestseller.