yeah SF is special…
I like the approach looking at revenue!
But when looking at revenue we should also consider total investment needed not only time.
Getting to 10b with 2.5b investment (did they reach the 10b before or after IPO?) vs 60b is quite different.
Plus Facebook invested early to diversify with Instagram, WhatsApp etc. which IMHO leads to a healthier company long run but slowed down getting to the number.