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This needs to be repeated: If private companies - Facebook, Twitter, etc - dominate the "public sphere" (cf. Habermas), then preventing people from accessing their resources has free speech implications.
This isn't necessarily a matter of rights, because all talk of rights, particularly positive rights, is difficult, but it's a free speech issue nevertheless, because it involves depriving people of the ability to be heard, of the ability take part in the conversation at all.
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