I'm sympathetic to the argument that Facebook/Twitter/etc. are too large and have too much power for lobbying/influencing public discourse, although I think if

I'm sympathetic to the argument that Facebook/Twitter/etc. are too large and have too much power for lobbying/influencing public discourse, although I think if anything making them a public utility would make that situation far worse as opposed to just breaking them up or something else to make the market more competitive But also just because they are big platforms why does that give people a right to be on them? Is my speech less free because I have a smaller audience?