When I went through the full testing that underlies the stereotypical personality types (such as introvert<>extravert, intuition<>sensation, thinking<>feeling, judging<>perceiving), I was identified as a particular subtype of the introvert. The Expressive Introvert.
We Expressive Introverts procsss everthing internally. Then we need to tell someone outside what we think.
Sounds to me like the archetype of a blogger. 😉