You Know Those 'Instant Personalitigrams' (meaww, nametests &c)? How Do Those Work?

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You know ... those sites where they say they'll tell you "what kind of story-character you are" or "which friends will fill certain roles in your life," and then 'analyze your Facebook-page' and give you a 'conclusion' to share on your Facebook-page ... For instance, a friend of mine put her 'Who Are You?'-conclusion on her page; which I saw, opened up & got my conclusion (above) ... which was exactly the same as hers! (except they were my pictures & not hers) I wonder how such things are auto-judged like that ... What does the program see on my Facebook to tell such things about me? (to compare, my facebook ID--I think--is uncle.mythman)