It highlights very well how our online world has changed. Back in 2007 people spent a good deal of times in places called Yahoo!, MySpace and AOL.
Social Media
The social media map of the world - how it changed: 2007 -2010
As a tribute to XKCD's 'Map of Online Communities' that was created in 2007, Flowtown have re-created the map and updated it for 2010.