Google actually relies on our users to help with our marketing. We have a very high percentage of our users who often tell others about our search engine.
Search engine marketing and search engine optimization are critically important to online businesses. You can spend every penny you have on a website, but it will all be for nothing if nobody knows your site is there.
Exploration is the engine that drives innovation. Innovation drives economic growth. So let's all go exploring.
Marketing has always been about the same thing - who your customers are and where they are.
Search is an unsolved problem.