While StumbleUpon is still a popular website, there was a time when it was one of the key ways to try to make your web content more discoverable. StumbleUpon lets you discover web content within a wide variety of categories. Now, there's a free app for the iPhone and iPad that lets you "stumble" around within these categories. TechCrunch's MG Siegler says:The iPad Was Built For Something Like StumbleUpon, Now They Have A Worthy AppI take the flipside of the view. I believ [...]

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