The Four Pillars of a Digital Public Space

Facebook and Twitter could build this. Digital designers could think about what kind of conversations do we actually want to invite? And how do we build specifically for those kinds of conversations? But the difference is with a physical public space, at least those people come with at least one thing in common - their bodies are in the same place. How that is not the case with being on the World Wide Web. Like, who decides online? Are we talking about creating kind of a governance? What does this look like if we put those four pillars to work in a digital public space?