For too long, large global companies have had control of the world's social networks—and dictated the path of innovation. Even as social networking became a critical service, these companies make the calls, behind closed doors, that shape our digital public square—and our lives. It's time to restructure the competitive landscape for open innovation. To unlock the power of diverse builders to reimagine how social networks serve people, not platforms. To redefine scale as a collaboration that benefits all, instead of a race in which one winner takes all. It's time to take back the public square.