XKCD has created a couple of maps plotting online communities in 2007 and 2010 (click for a much larger image):


About xkcd:
A CNU graduate with a degree in physics. Before starting xkcd, he worked on robots at NASA’s Langley Research Center in Virginia.
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About Annette Bradford
Annette is a web developer and programmer with a strong background in C++, C#, PHP-mySQL, and HTML/CSS/XML