Actually, it almost more demonstrates the tendencies to openness inherent in the signs. All the fire signs are way up there, who are theoretically more likely to be outgoing, open with themselves - hell, more likely to have a livejournal, maybe.
Which sun-sign am I most friendly with?
Edit: Actually, upon seeing the results of this meme through my friends list, the high-scoring of fire signs does not seem to be prevalent at all; in fact, there are plenty of people getting nearly opposite results to mine. So maybe it's more accurate than I thought. Or maybe it, like so many memes, is once again nothing more than mental masturbation ;)