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

The right answer on raises is you have to be formal. You have to be formal to save your own culture.

It's hard in daily life. It's even harder in management because it's the stress of the moment.

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.

As companies move to web-based computing they get a lot more servers, which are difficult to manage and control. All kinds of problems can arise - security, quality and worms.

A CEO needs great intelligence and great courage. And I always found my courage was tested more.

The bigger you get, the harder this gets because the more aggressive the people working for you are.