It's not like a map of Earth, nor a map of Mordor! It's the map of our Virtual darkness!
Every site is a circle on the map, and its size is determined by website traffic, the larger the amount of traffic, the bigger the circle. It also shows that when we decide to switch to another site, that new site appears closer to the site we've just come from. So you can see which sites create strong links with other sites. Making sense so far?
There's also the capability of working out what country is looking at which site. Here's the link to the Internet Map.