How did Facebook become a $850 billion company?

When the news came out that Facebook had for the first time overtaken MySpace in users and that MySpace has responded by sacking nearly a third of its workforce, people asked the obvious question: Since these sites serve approximately the same purpose – facilitating social networking among online-friend networks – what is MySpace doing wrong? Or, more accurately, what is Facebook doing right?

https://youtu.be/p2RCPyv95SE?si=s5hkeI-uIG8GjjjY