[prewett]

A bubble is "everyone buying because everyone knows someone will buy even higher." "Everyone uses..." is a great example of a revenue generator. I assume you are meaning that you buying based on popularity of places you frequent is an example of an echo chamber?

Regarding non-consumer facing companies, I don't see what the problem is. If you have no information about the company, then it's gambling to buy it. So you miss out on some companies, no big deal. Most people only have enough money to make a few bets, so you should bet on what you know about. It's not like a test where you lose points if you don't answer a question; you don't lose money if you don't buy a stock you don't know about.