Biz Stone is an American entrepreneur best known as a co-founder of the social media platform Twitter. He played a significant role in the development of the platform, which allows users to share short messages called tweets. Stone's innovative ideas helped shape the way people communicate online. In addition to Twitter, Biz Stone has been involved in various other ventures, including Obvious Corporation, which focuses on developing new technologies. He is also an advocate for social entrepreneurship and has worked on projects that aim to create positive social change through technology.