laire Williams Díaz leads social innovation and philanthropy at Twitter. She holds an MBA and other degrees from Stanford and Oxford Universities and was a fellow with the Skoll Foundation. She co-founded Hope Runs, a non-profit organization in Kenya. She is a published author and writes on such diverse topics as social media strategy, saving money, and generation Y. Her first book appeared in 2010. Find her at www.claire.us.com or via @clairew on Twitter.