I like the “small squares” style used in Social Media Demographics for displaying demographic data.  The “by age” section is hard to read because it lines up so nicely with the site legend.  It’s also a little confusing to have the sites change axes for the different sections.

Numerous social media sites have witnessed explosive growth of their user bases in the last several years, but it’s a known fact that the type of user a site attracts varies greatly. Have you ever wondered which sites attract the most educated of social media users, or those that pull in the highest income? Below we map the demographics of the world’s most popular social media sites.

Is MySpace really that popular with the 0-17 crowd?  What year is the data from?

Found on Flowtown.com