User experience is everything. It always has been, but it's undervalued and underinvested in. If you don't know user-centered design, study it. Hire people who know it. Obsess over it. Live and breathe it. Get your whole company on board.

The things that keep nagging at you are the ones worth exploring.

When you’re obsessing about one thing, you can reach insights about how to solve hard problems. If you have too many things to think about, you’ll get to the superficial solution, not the brilliant one.

Our problem wasn’t that it blew up and was impossible to scale, but there were some bad choices made. One of the biggest lessons time after time was to focus. Do fewer things.

Failure of your company is not failure in life. Failure in your relationships is.

When I meet with the founders of a new company, my advice is almost always, ‘Do fewer things.’ It’s true of partnerships, marketing opportunities, anything that’s taking up your time. The vast majority of things are distractions, and very few really matter to your success.

I tried to be a ski bum when I stepped away from Twitter, and I wasn't a very good skier.