I feel this reasoning easily slips into no-true-Scotsman territory. Did FB have product-market fit in 2006? 2008? 2013? They didn’t just move fast during prototyping, this went on for years and years of hypergrowth. There was customer backlash at each major release as they overhauled the product but it turns out they knew better than the customers themselves knew what they wanted.
Friendster and MySpace by contrast slowed way down once they hit traction, but it didn’t enable them to solve their scalability issues.
> it turns out they knew better than the customers themselves knew what they wanted.
do we live in the same universe ? facebook has already one full step in the big storage room with myspace, omegle, etc. most teens I know laugh at you if you say you're using facebook like you're some decrepit old person.
Friendster and MySpace by contrast slowed way down once they hit traction, but it didn’t enable them to solve their scalability issues.