The main reason I don't have a Tumblr is that I'm currently still managing to get about 7 hours of sleep a night in between Facebook, Livejournal, Twitter, Gchat, and MSN.
However, I think Tumblr is a marvelous thing when used to its full potential. For example, I would deem
Tony Stark Facts to be an excellent use of Tumblr, apart from the fact that
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