Are any of you members of Stumble Upon? If so, what is your profile name?

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Although the subject mostly gave it away, to reiterate, are any of you members of Stumble? I think it's a fairly good system- better than Digg, anyway, but personal opinions aside- it gets the job done. Promoting work, finding new things, whatever... Are you a member of Stumble, or even Digg? And if so, which do you like better? -Fresh Writing