Boo

Boo belongs to a San Francisco based Facebook executive who created a Facebook page for the dog with a statement "My name is Boo. I am a dog. Life is good." He became popular in October 2010 after singer Ke$ha sent a tweet that she had a new boyfriend, linking to the page, and Khloé Kardashian called him the "cutest dog on the planet".[1][2]
Chronicle Books, noticing that Boo had 60,000 Facebook fans at the time, approached the owner to write a picture book, Boo: The Adventures of the Cutest Dog in the World. Written by his owner under pen name J.H. Lee, the book was eventually published in ten languages. A second book followed, Boo: Little Dog in the Big City, as well as a calendar and plans for a cut-out book and additional children's books.[1] His merchandise includes a Gund stuffed animal.
Boo was appointed a "spokesdog" for Virgin America airline, which featured photos of him in an airplane along with advice for people traveling with pets.[1] Boo was the subject of a death hoax in April 2012.[3] In July 2012, Boo was named the Official Pet Liaison of Virgin America.[4]
Mike Isaac of All Things Digital outed Boo's owner as a Facebook employee in August 2012.[2][5][6] As of June 2013, Boo has over 7 million fans on Facebook.