The most common mistakes are showing people your product- don't show them your product, it's sort of like telling them bout a feature.

Twitch launched in June of 2011, and our growth ever since has exceeded even my expectations, which were not small. A year and a half later, the community of broadcasters and viewers has multiplied hundreds of percent.

This is true for most new products. The majority of people you're competing with are non-users. They are people who have never used your service before. And what they say is actually the most important. What they say is the thing that blocks you from expanding the size of your market with your features.

People who are using your product and putting up with all these issues, means that they are not actually the biggest problems.

Sales is this cure all for this problem. Get people to give you their credit card and I guarantee you they're actually interested.

Most startups are not just built for the person who is using them. When you do that, every now and then you get really lucky and... are representative of some huge class of people who all want the same thing you do... but very often that just turns into a side project that doesn't go anywhere.

Recording interviews is like magic. a) It stops you from taking notes in the middle and b) you can play that recording for people.