User experience is everything. It always has been, but it’s still undervalued and under-invested 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.

Evan Williams, Twitter

Your idea might be great, but users have a low friction tolerance. They’re the only thing that will make you successful. Without users, all you have is an idea.

The strongest thing you can cultivate as an entrepreneur is to not rely on luck but cultivating an ability to recognize fortunate situations when they are occurring.

- Jack Dorsey, Twitter

And sometimes we allow those with the most luck to impart wisdom upon us.

Timing, perseverance, and ten years of trying will eventually make you look like an overnight success. — Biz Stone, twitter
Another story about establishing the product (four years between first tweet and first $), before letting your salespeople drive it.

Another story about establishing the product (four years between first tweet and first $), before letting your salespeople drive it.