Dot Distribution Map

http://www.petapixel.com/2011/07/12/beautiful-heat-maps-of-flickr-photographs-and-twitter-tweets/

This shows a dot distribution map--although it looks like a satellite image, it is actually a map of Twitter and Flickr activity by location. The orange dots are photos uploaded, the blue dots are Tweets on Twitter and the white shows an area where both were found. This type of map is interesting because it shows the activity of users on the internet and shows the prominence of certain sites in different areas. One dot represents one tweet or picture, so the size of the dots does not change like in a proportional circle map.