Sarah is the co-author, with Tim O'Reilly, of The Twitter Book and a frequent speaker on social media for business. Previously, she was on the senior editorial staff at O'Reilly Media, where she founded Tools of Change for Publishing (TOC) and led development of the Missing Manuals. Before joining O'Reilly in 2003, Sarah was a freelance writer and editor, and a regular contributor to The New York Times. She was also the CSA program founder for Just Food, a local-food-and-farms non-profit, and co-founder of Two Tomatoes Records.Bonus fact: she was the 21st user of Twitter.