Plus, there is this worry that the person will go "You think I'm _____? How can you think that? Justify it you son of a bitch?" even when you're picking the most apt of the worst.
That said I will probably fill yours out eventually and will also probably offer it as an option to my friends list (though I cynically know most wouldn't fill it out, but it offers me a chance to subtly pimp my other list again).
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Having said that, I haven't been able to fill out anyone else's for pretty much the same reason you gave. :-)
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