See that dark figure in front of the sea of empty red chairs? That's Mark Zuckerberg, the co-founder of Facebook and the 22nd wealthiest person on the planet.
This recently uncovered video shows Zuckerberg giving a talk to a damn-near empty room at Harvard in 2005, way before Facebook became what it is today. An empty room like this would be impossible now if Zuckerberg was there. Anywhere. Hopefully those students learned something that day.