We have never had a public town square larger than a literal town square, excepting maybe ham radio. Every other space has in some way been moderated or fashioned to purpose. Even public TV, news and radio are groomed to certain standards.
And yet we've had demonstrations and protests that have drawn hundreds of thousands of people, perhaps millions, into the streets around the world to demand change or rally around causes.
Where does that happen online, with the guarantees afforded by only the rule of law?
Various governments have ways to petition online. Change.org or whatever is reasonably open to things covered by the first amendment, though of course it is privately controlled without real guarantees.