December 12, 2007
The easier it is to find places with good information, the less time users will spend visiting any individual website.

Information Foraging: Why Google Makes People Leave Your Site Faster -Jakob Nielsen

Google has made the battle for attention more competitive. If you want people to explore your site, you need to make the path to reaching their goal as clear as possible and consistently provide great experiences that lead people to think of you as a reliable resource.