Split Personality

From reading another blog, I found a website that, through some unknown method, analyzes your blog entries and determines your blog’s Myers-Briggs personality. According to this site my blog in an ESTP or an Extraverted, Sensing, Thinking, Perceiving person. I wanted to see how accurate my blog represented me, so I went to another site and took my own Myers-Briggs. According to this site, my blog represents my personality’s polar opposite. This sites says that I am an INFJ or an Introverted, Intuitive, Feeling, Judging person. I find it interesting that our of 16 possible personality types that my blog and I did not share a single common trait. Am I not representing myself well on my blog? or is my inner voice that different from the outer? or is all of this just hooey?