Twitter co-founders Biz Stone and Evan Williams were recently on stage at the TechCrunch Disrupt event. They were there to talk about their new publishing platform company called Medium. The two are working with Hunter Walk on this project. When on stage, Evan Williams noted that Obvious will not work on an API right away. He said that an API needs to have a purpose and developers have to be really conscious what they want to do with an API. ?We didn?t have that all figured out with Twitter,? said Williams. Notable Twitter has been criticized recently for allow developers to have access to their API and they restricting it and even cut some companies off. Williams stepped down as Twitter CEO in 2011 and spent a lot of time skiing. Now he is running Obvious Corp. full time with Stone.