Earlier quoted context omitted.
Having a voice doesn't not equal being heard. Especially not if you define A Voice as writing on Facebook or Twitter. You might as well stand on a box in the dead parts of Detroit and talk politics. Being heard in a democratic country means your vote matters.
Nobody has the right to "be heard"! That's the thing. You have the right to scream it out loud, but nobody is forced to stand there and listen. No - you can't falsely equate "being heard" by being on FB and Twitter to voting. If my neighbor starts screaming Nazi talking points, I have the right to walk away. They still have the right to scream them. Buy Facebook isn't "forced" to carry their views, either! And the Na…
The online equivalent to "having the right to walk away" is blocking someone on a platform. It's that simple.
Once a company has reached a monopolistic size, which describes FB and Twitter, then it either needs to be broken up, or treated like a utility/government service - this is exactly the argument that you see all the time about e.g. ISPs and Alphabet/Google - because there's no other morally excusable way to act. The first amendment was written to only apply to the government because that's the entity that's the most likely to (and most dangerous in) silence speech and discourse, not the only one.
You definitely would not be making these arguments if it were your ideological tribe that were being censored.