In 2021, I am a little surprised and amused to see so many people who seem to be shocked (shocked!) that the things they post on the Internet might get archived

In 2021, I am a little surprised and amused to see so many people who seem to be shocked (shocked!) that the things they post on the Internet might get archived forever. Especially on HN, where technological literacy tends to be a at least a little bit higher than than the average tweeter. Even back in the early days, it was a common-sense rule of thumb that you never put something on the Internet that you wouldn't want written in the newspaper about you, even in "private" forums such as IRC channels and email. Let alone something as public as twitter.