People talk about ideas as being worthless, etc. No, they're not. You can't get an oak tree with a mustard seed. But there's a big difference between even oak trees. Idea and execution are the same thing, just two ends of a continuous line.
The films La Femme Nikita and Point of No Return have nearly the exact same plot. The former is one of the greatest action films ever made; the latter is one of the worst.
That whole "build something people want" is only for people who want to make money. And honestly, if what you want is to make money, be a dentist.
People waant Facebook and Twitter and Farmville. But they need core technological innovation. They need better ways to work with data. You did the right thing, Andrew. It wasn't a waste of time. And I won't stop either, because the world has far too much of what it wants and far too little of what it needs.