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There’s no doubt that Burger King has seen the light when it comes to viral marketing. It has produced a number of viral microsites to promote its products.

Recently, to raise awareness for its Western Whopper, BK released a microsite call Pet Moustache. You simply upload a picture of yourself and use the tools on the microsite to grow, groom, and style your new facial hair. It’s like a digital pet rock, but hairier. After you’re done, you can save the picture and send it to your friends.