It's essentially a cultural cancer that is killing the US, making it a widely intolerable place to exist. People have been excusing it for many years now, pretending that it's just extremists being cancelled (and how that's no great loss), however that's not remotely close to true at this point. The US is increasingly becoming oppressive culturally. What's happening is almost the opposite of the 1960s-1970s cultural revolution; the cancel culture mobs today are like the Spanish Inquisition, they're kind of like zealot intellectual prudes (but for their biases, their ideas; traditionally prude refers to being easily shocked about eg nudity or sexuality, but in this case it's triggered SJW types largely regarding matters of intellectual discourse).

Over the span of about the prior 10-12 years in China the authorities there decided to crack down on speech online increasingly. For a time, in the early 10-15 years of the Internet there, China actually had a modicum of loose (not free) speech online, where you had a bit of room to talk about subjects that were close to taboo. That's all gone now and has been for years. That process of erosion, crack down, is what it feels like is happening in the US, merely under a different mechanism; instead of a central government authority implementing the oppression, it's mob platforms like Twitter and Facebook where the platforms openly allow hyper aggressive and concerted attacks to take place as a matter of routine. And even though it's not the government doing it, the effect is similar: they go after your life, your job, your friends, your character, your home, your family, your safety, anything they can.

The only solution is to abandon services like Twitter and Facebook, deplete their power. About 15-20% of my Facebook friends (quite normal people, not extremist types, not privacy advocates, etc.) are abandoned ghost accounts now, deleted, paused, etc. In talking to some of them, they got a taste of the horrible nature of how FB can be used as an attack mob platform, how ugly and or toxic it can be, and they wanted no part of it. Hopefully that process keeps spreading.

This decade we'll see a massive rise of walled encrypted communities, where outsiders will largely be kept out for the safety and health of the community. Outsiders will be treated with intense scrutiny, like we were back to living in tribal times (intellectually we're back to living in tribal times). People will begin to live in intellectual silos online to protect themselves from the attack mobs. They won't be decentralized as techies would hope, they'll still be centralized and hosted in the cloud. Interestingly this process will make the divisions in the US worse, the bubbles will become worse; and it will also be considered a big problem by authorities as extremists will begin very commonly using these walled-off encrypted groups/communities to organize out of sight (Parler / Gab will end up as a public fluke, most of those people will end up in hidden-away silo'd communities as the scrutiny continues to get worse on their bad ideas). Authorities will use this process as another argument to go after encryption.

Now would be a good time to build a new version of a social groups platform. Ning as a concept will end up being a $50-$100 billion product, although not quite as they envisioned the concept (they flubbed the entire thing). You want to lean in to selling to tribal intellectual isolation, intellectual bubbles, bet on that not against it, for that's the direction and there is absolutely nothing that's going to stop it. Public Facebook will shrink, public Twitter will shrink, private isolated social groups will dramatically expand. Whoever makes this easy and safe (encrypted, no data leaks, no hacks, top focus on security), in the cloud in a centralized manner, will win and win very very big.

edit: To the downvoters. I know you don't like it, I understand. That doesn't matter, it's the future regardless and nothing is going to stop it. It's about the most obvious thing, frankly; comparable odds to the sun rising tomorrow. It's almost comical that people think you can stop the expansion of the tribalism, the intellectual bubbles, at this point. It's going to get dramatically worse. There is one clean solution to the attack mobs as the tribalism expands, and that's going to be isolated social groups that are weary of outsiders, encrypted, in the cloud. My advice to anyone that reads this: focus on protecting yourself, your family, your friends, anyone you care about; the US is gone, lost; and as the tribalism expands, as the violence, chaos and mobs expand, you're not going to have energy or time to dedicate to grandiose silly fantasy notions like saving the world or fighting the intellectual & political ocean tides, your thinking will need to get more primitive, more self-interested. I'm not talking about survivalist absurdity, I'm talking about general personal welfare in a time of intense social/cultural strife and unraveling, where people will be increasingly at eachothers throats.