After the interest in our previous blog post about the differences between Mac and Windows users, we thought we would reach into Thoof’s algorithm once again, this time examining the differences between GMail and Yahoo Mail users. Here are some of the more interesting observations:

• Yahoo Mail users were 15% more likely to click on a story about cellphones relative to GMail users (a stat that may change rapidly if rumors of a Google cell phone prove to be accurate), and 5% more interested in stories about phones in general
• Yahoo users were also the more frugal of the two, expressing a 4% bias in favor of stories about personal finance, and a 6% bias in favor of stories about savings
• Lastly, Yahoo users seem to be more interested in fitness, expressing a 9% bias over GMail users

And what interests GMail users?

• GMail users seem far more interested in politics, expressing a 6% bias in favor of stories about the Bush Administration, 4% in favor of stories about Hillary Clinton, a 7% bias in favor of stories about Afghanistan, and a 5% bias in favor of stories about Iran
• GMail users also seem more academic and technical, expressing a 4% bias in favor of stories about Physics, Mathematics, and Computing, and a 5% bias in favor of stories about Programming
• Lastly, GMail users seem to be more likely to be fans of Flickr, expressing a 4% bias in favor of stories about that website

Do you have any explanations for these biases?