If you don't need it yourself, and you're building something that someone else needs, realize you're at a big disadvantage.

The tenth social network, and limited only to college students with no money, also terrible. Myspace had won.

Whatever the founder cares about, whatever the founders think are the key goals, that's going to be what the whole company focusses on.

If you don't need it yourself, and you're building something that someone else needs, realize you're at a big disadvantage.

No matter what you choose, build stuff and be around smart people.

It's difficult to get large groups of people, to the extreme levels of focus and productivity that you need, for a startup to be successful.

You want an idea that not many other people are working on, and it's okay if it doesn't sound big at first.