Five Million Users And Nearly Five Billion Stumbles Later

Sometime today, StumbleUpon will register its five millionth user. (At the time of this writing, it is at 4,994,826 registered users). That number is kind of meaningless because it counts anyone who has ever registered for the Website-rating and discovery service, and who may no longer use it. StumbleUpon, which is part of eBay, does not disclose h

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