A public space is government's backyard, the argument is moot. See China - government acts as the censor, not ISPs or companies. To favor "public spaces" it's

A public space is government's backyard, the argument is moot. See China - government acts as the censor, not ISPs or companies. To favor "public spaces" it's not enough to argue that private backyards have censoring issues, but that public spaces would not have them. More so, anyone can open his or hers private space to say what he or she wishes in the internet, much more easily than IRL. For instance, if my country prohibits me to speak about certain topic, with a bit of cleverness I can anonymously rent a VPS in another country. If the issue is just a deleted Facebook post, moving out to the competition or creating your own blog is trivial. The real issue is government censorship, which is enforced by the use of force. You can easily leave a website, but not so easily leave a country.