Reposting to fix formatting:
This article is wrong on so many levels, I honestly don't know where to start.
First, it advocates fixing a monopoly problem (All speech concentrated in Facebook and Twitter) by trying to change liability laws. There is an entire section of our legal code devoted to fixing monopolies. Use the right tool for the job.
Second, it rather naively assumes that:
A) Facebook and twitter will only remove the most controversial speech.
In reality, once you open the door for liability, they become liable for literally anything anyone gets upset about enough to sue over. They may win most of the court cases, but they are at the mercy of anyone who can afford to file court papers, nationwide. The costs of the cases and the risks of losing even one case will mean that their only option will be to ban anything more controversial than "I had a salad for lunch".
B) Other social media companies will be willing to take risks that Facebook and Twitter won't.
If a company the size of Facebook, with it's thousands of moderators, can't even slow down the deluge of bad content, let alone stop it, what makes anyone think that a smaller company will have better luck? The worst actors aren't going to suddenly go quiet if Facebook bans a few of them, they will simply go flood some other smaller provider that has even less capability to deal with the problem. Said provider will quickly be sued into oblivion.
C) That an open internet forum is even possible if the provider becomes legally liable for user posts or for failing to moderate said posts.
On any given day, there are literally tens of millions of posts on a forum like Facebook. It is quite literally impossible to have a human review all, or even a fraction of those posts. You can try to have a user reporting system, but experience has shown that any system like that is vulnerable to brigading and mass abuse by people who want their opponents silenced. Practically speaking, moderating any large internet forum either requires that every single post be hidden until approved by a moderator, or that the moderators are protected by the equivalent of Section 230.
In other words, the internet exists in it's current form because of Section 230. You can try removing it, but what you get as a result won't be an open internet forum. It will either be a completely locked down locked down site where all but the most uncontroversial posts are deleted, or a vile cesspool of a site (like what happened to Parler) where people feel free to vent the worst impulses of humanity directly onto your screen with no moderation.