Dave McClure angel investor and Founding Partner 500 Startups
“The ability to get real-time data and feedback is unique to the Internet.  you can take advantage of that and build better products by collecting real-time usage metrics and by making decisions based on measured user data.
 What’s really hard is simplifying your product and building a great user experience.
It’s important to start by building a culture of feedback and measured analytics into your process and your organization.  start-up success often boils down to your ability to do two things: make money and make users happy. If you can figure out how to do both of those things at scale, then you probably have an interesting business . Luckily, you can tell if users are happy or not by measuring their behavior.” Dave McClure, Obsess over Metrics, pg 183-184 Do More Faster by David Cohen & Brad Feld