My point is not that they NEVER existed, its that they no longer exist in the capacity most people mean when they use the term. As you mentioned, cities used to be organized around them. Most people now live in cities that are either don't have one at all or don't have one that is used in the way they were hundreds of years ago.

Furthermore, the behavior that was tolerated in the town square would not be close to what we tolerate online. And we don't afford kids the freedom in the real world that we do online. I am not sure why people think that requiring parental consent or age verification online is some sort of assault on personal liberty.

Requiring age verification online for adults is the only way to keep kids out.

And requiring identification to lounge on the town square is generally considered unconstitutional in the U.S.

I don’t know how to square this circle. Can you conduct age verification without requiring identification?

I think this again comes back to the idea of thinking of it as some sort of digital town square.

We don't seem to have an issue with the government requiring businesses to check ID for alcohol, tobacco, porn (in the physical world), and firearms. Movie theaters check ID for rated R movies if you appear to be under 17. In fact, a lot of online retailers of alcohol and tobacco now require ID to be verified at purchase instead of at delivery.

Facebook/Twitter/TikTok/etc are not the digital town square; the most charitable analogy for them is they they are merchants in the town square. And the rules should still apply to them.

For the most part, those real-world ID checks do not involve keeping a record, or a durable storage of what you say, or see, or listen to while you're there.

There's nothing preventing us from the law requiring the same for online verification. It doesn't have to be the case that Facebook or Twitter or whatever store any information other than at some point they did verify your age.

As to the other information, you're more making the case that online tracking should be illegal (which I'd agree with). For the majority of people, they are either unaware or uninformed about how to prevent online tracking to a sufficient degree. If you're signed into your Google and Facebook accounts and then surfing the web, theres a good chance you're getting caught up in cross site tracking. Hell, even if you don't have accounts explicitly, its not like Facebook isn't tracking non-users. In the real world, stalking is illegal.

Also, in my state (Washington), IDs now have barcodes on them. When I buy beer at the store, the clerk doesn't even look at my ID; he/she scans it and thats it. I'd hope the information about what type of beer and how often I buy it isn't being stored somewhere but I'm just hoping.