Typealyzer asks you the enter the URL of a blog, and attempts to determine the personality of the author according to the Myers-Briggs Type Indicator. (via Megan McArdle.)
Naturally I immediately put in the URL of this blog and was told I am an “INTJ”, which it describes as a nerdy scientist type. Then I put in the URL of my other blog, where I write about “fun” stuff. This time it said I was an “ESTP”, which it describes as “active and playful.”
Of course these blogs have very different tones. Nevertheless the term “personality” as used by psychologists (including Meyers and Briggs) is something that applies to people, not blogs, and it is not supposed to change depending on what you are writing about. If Typealyzer gives different results for two blogs written by the same person, then it is not a reliable measurement technique.
Typealyzer also displays a chart purporting to show which areas of the brain were used in writing the blog. I’m not an expert in this field but I suspect this is pure hokum.