36. Evan Williams, Jason Goldman, Biz Stone

Co-founders, Medium and Obvious Corp

Twitter co-founders Ev Williams, Jason Goldman, and Biz Stone, teamed up again last year to launch a new startup.

Unlike Twitter, Medium is a blog platform that encourages people to express themselves in long-form.

In addition, the three created Obvious Corporation, a startup incubator that helped Branch and Lift get off the ground.