There just wouldn't be that middle area where social media sites get to choose what you are allowed to say or read just because they have a monopoly on the data.
For instance, you could run your own individual Hacker News site that collects the data and creates the same thing you see today - except you could choose to only view posts and comments by sources verified as humans. Or you could turn on 'show dead' on a grander scale - your choice.
Section 230 isn't required for social media.