Yeah, I became a successful entrepreneur... Eventually

The primary thing that any technology startup must do is build a product that's at least 10 times better at doing something than the current prevailing way of doing that thing. Two or three times better will not be good enough to get people to switch to the new thing fast enough or in large enough volume to matter.

It turns out that is exactly what product strategy is all about—figuring out the right product is the innovator’s job, not the customer’s job.

The one thing with stress is, you've got to keep your focus on what you can do, not what happened to you.

If you manage a team of 10 people, its quite possible to do so with very few mistakes or bad behaviors. If you manage an organization of 1,000 people it is quite impossible. At a certain size, your company will do things that are so bad that you never imagined that youd be associated with that kind of incompetence.

Wartime CEO is too busy fighting the enemy to read management books written by consultants who have never managed a fruit stand.

Groupon looked like a very high valuation, but any investment in a great company at any stage is almost always a good investment.