If you build something you love, chances are someone else will love it, too. If you use something you love, chances are someone else will love it to. Incremental things that we love can spread like wild fire (Facebook, Twitter, and reddit), and they have changed the world; further incremental products will likely do so, too.

...An interesting discussion is whether these things we love make the world a better place. Another interesting discussion is if engineers and entrepreneurs focus too much on the things we love instead of the things the world needs.