You can't have it both ways. Either facebook/twitter/instagram are common-carrier public squares, or they are private corporations. If they are private corps, they can block whatever they want. If they are common carriers, they can't censor people, but they will also have to open up their platforms to competition and submit to more government oversight to allow for fair and equal access.

I see no issue with the second option. Do you have an argument against that?

Nope. I'm for it. But you can't get upset about social media "censorship" without calling for these companies to be treated as common carrier / public squares and I see a lot of the former and not a lot of the latter. I suspect because gov. regulation of enterprise is traditionally opposed by the same right wing that is currently upset about social media censorship.

I think you missed the irony in GP's comment