I hope many of us internalized this early. It's not very accurate, but I try to think of this as meaning that on average, everything I post online is being read by a minimum of 99 people, multiplied by either the upvote count on the thread (for HN) or the number of active followers I have (for Twitter). It has helped me to always think this to myself before posting something. I probably am biased from the culture on…
That's why I left Quora. I'm a really gullible person, and I was going to respond to somebody who posted something inflammatory, then I realized I had the option to just walk away. So I did. I remember something similar about companies too. When you have product market fit, customers will sear you when your product doesn't work. If you don't, you'll never hear from them again.
It's just all around incredibly unpleasant. I loved Quora in its early years when it was invitation only, but I don't ever want to have anything to do with it again.