Earlier quoted context omitted.
Twitter isn't a public space. It is a privately owned platform.
I'm pretty confident that if a suitable case made it to the supreme court, social media like Twitter would be deemed a de facto public square under the US Constitution. Hopefully then people would apply a little more critical thought, rather than just parroting private vs public. It's clear that at a certain scale, a private space becomes de facto public one, similar to anti-trust legislation breaking up perfectly va…
However, the key distinction between limited public forums and private forums is that the government creates the former. Twitter is private, and it has constitutionally-protected freedom of association to choose who it can associate with and constitutionally-protected freedom from being compelled to speak certain viewpoints. Any government that attempts to require social media to let everybody speak will find itself facing a constitutional challenge, as such a law is laughably unconstitutional. (Indeed, Texas and Florida have already written such laws, and they've already been enjoined for the very same reasons).