When you hit this button Google takes you directly to the site it think would be most helpful to you according to the search you did, rather than bringing up a list of relevant sites you have to scan through
Everyone misses the real use of the button. Google is very clever. Pause on the button it spins. It displays im feeling puzzled, steller, funny etc. These are sites related to that idea. To spin again move mouse away the back over youl get a dif, im feeling.