The world's most successful entrepreneurs play hard, but they work even harder.

Starting a company is a cause, not a job. Once it becomes a job, that's when you lose

Sharing with just your friends doesn't protect your privacy. I know the people at Facebook will disagree and argue that users can control what is shared with whom. But this is simply an illusion that makes us feel better about all the sharing we have done and are about to do.

Building a successful company (or living a happy life, for that matter) is not about embracing someone else's philosophy, but staying true to your own beliefs about the world and learning from the mistakes you make along the way.

The big reason why we don't have space colonies and regular trips to the moon is that flying into outer space is just plain 'hard.' The business of safely transporting people off the Earth is a costly affair that requires a lot of technology.

More and more, the things we do in real life will end up as Facebook posts. And while we may be consoled by the fact that most of this stuff is being posted just to our friends, it only takes one friend to share that information with his or her friends to start a viral chain.

The world's most successful entrepreneurs play hard, but they work even harder.