> Twitter is a public company ok?

(1) it is, in fact, not a public company, and

(2) it used to be a “public comoany” in the sense of “has shares traded on open stock markets rather than exclusively in individual off-market trades”, but that sense of “public” is still not a government actor covered by tbe restriction on the federal government in 1A or that on state governments in 14A. That is simply a different sense of the words “public” and “private” then is relevant here.