Stumbleupon uses QR code on their Facebook page so users can download Android App

StumbleUpon's Photos - Wall Photos

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Click on people's faces in the photo to tag them.

To get the StumbleUpon App for Android, point your Android phone to this QR Code. Your barcode reader should be able to read it and launch the Market Application. Or, if you are reading this on a phone, go to www.stumbleupon.com on your phone's browser and get the app from there.