Everyone wants money. People get money by doing jobs. Everyone wants prestige. People get prestige by working at bigger companies. And money and prestige gets you relationships. And LinkedIn is like a magazine that advertises opportunities to get prestige and money. And let’s calculate how much revenue LinkedIn makes. Let’s say one out of a hundred finds a job using LinkedIn.

So 2 million into 200 LinkedIn makes about $400 million a year. So the recipe is monetize a core human desire for a big TAM or with a big network effect and make it easy for people to get the thing done.