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To promote a shampoo that helps create not just beautiful hair, but also a healthy scalp, Lowe Thailand created a QR Code campaign for Unilever’s Clear shampoo. Volunteers, including a Thai celebrity, had QR codes shaved into their hair and then walked around the city encouraging people to photograph the codes, which took them to a mobile website about the shampoo. The campaign reached 10 million people!

via 2D-Code Blog