Sure but who owns and runs that? Who is responsible for the infrastructure costs, the operations of it, the uptime, etc..
The government? Which government? The Internet is global, so would you have a public Twitter for every country? How do you geo-restrict this then? Whose laws apply? How is it reported or enforced? Do we need "Twitter cops"?
You can throw out easy answers all you want but it's actually a really complex issue.
The govt, municipalities etc. Public spaces are public and the whole thing can be decentralized so it s not compute and bw heavy. It should be very cheap compared to e.g. roads
The government? Which government? The Internet is global, so would you have a public Twitter for every country? How do you geo-restrict this then? Whose laws apply? How is it reported or enforced? Do we need "Twitter cops"?
You can throw out easy answers all you want but it's actually a really complex issue.