Answer by taking a quote from the following article:

Breitbart was born in Los Angeles, California, on February 1, 1969. He was the adopted son of Gerald and Arlene Breitbart, a restaurant owner and banker respectively, and grew up in the affluent neighborhood of Brentwood, Los Angeles. He was adopted at three weeks old and raised Jewish. His biological parents had been Irish American.

Breitbart has been lauded for his role in the "evolution of pioneering websites" including The Huffington Post and The Drudge Report, and more recently his "Big" sites. Journalists such as Nick Gillespie and Conor Friedersdorf have credited Breitbart with bringing new voices to debates about politics and culture. Breitbart told Reason in 2004 that after feeling ignored by existing outlets, "We decided to go out and create our media." Described as "a series of do-it-yourself demonstration projects" and "conversation pits", the Breitbart.com websites have been both criticized and praised for their role in various political issues. Breitbart has been recognized for adopting an inclusive stance with regard to LGBT participation in the conservative movement. He has also been credited with helping to derail conspiracy theories about Barack Obama's citizenship.  In 1995, Breitbart saw The Drudge Report and was so impressed that he e-mailed Matt Drudge. Breitbart said, "I thought what he was doing was by far the coolest thing on the Internet. And I still do." Breitbart described himself as "Matt Drudge's bitch" and selected and posted links to other news wire sources. Later, Drudge introduced him to Arianna Huffington (when she was still a Republican) and Breitbart subsequently assisted in the creation of The Huffington Post.  Breitbart wrote a weekly column for The Washington Times, which also appeared at Real Clear Politics. Breitbart also co-wrote the book Hollywood, Interrupted: Insanity Chic in Babylon with Mark Ebner, a book that is highly critical of U.S. celebrity culture. On January 19, 2011, the conservative gay rights group GOProud announced Breitbart had joined its Advisory Council.  In April 2011, Grand Central Publishing released Breitbart's book Righteous Indignation: Excuse Me While I Save the World, in which he discussed his own political evolution and the part he took in the rise of new media, most notably at the Drudge Report and The Huffington Post.  In June 2011, Breitbart's websites broke the story that congressman Anthony Weiner was sending women revealing photographs of himself.

What was the book "Hollywood" about?
a book that is highly critical of U.S. celebrity culture.