This was an in-depth and fascinating account of Facebook from creation up through to 2010. The author spent a huge amount of time actually hanging out at the company and interviewing dozens of people to piece together the well-written account that you get here. While the author isn't afraid to criticize Facebook, this is an authorized book (though the author stresses in an interview that its content wasn't approved by the company) and one gets the sense that he was so awed by the company and the people working for it that he is a little biased towards them. But, he only gives the impression that he feels so warmly towards them because he was so impressed by them.