Posters he's describing are pure propaganda, all basically shouting "WORK HARDER AND MORE!"
Work harder... doing what? Facebook has 10,000 employees. What are those people doing all day? The guy wrote the first version working part-time while he was at school. Of course they have improved it, I know they got all fancy with their php jvm and nosql database and whatnot. But still... 10,000 people?
Tesla has about the same number of employees and they design, build, sell and service futuristic electric cars that accelerate faster than a Formula One racing car.