Its less a "Marketplace of Ideas" and more a "church or private establishment" on the network. Even HN isnt spot on sometime bad ideas do rise up when they it appeals to peoples emotions more than sensibilities.
Social media (and the internet as a whole) are shaped by and promote the values of those who create it. They allow certain interactions and not others. (to what extent are the creators the leaders of the social media companies, vs. the users?)
