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McKayla Maroney

After settling for silver in the Olympics vault competition, McKayla Maroney's disappointed stance quickly became a Web meme: McKayla Maroney is not impressed. (Ronald Martinez/Getty Images)

2012 Year in Review: Most viral photos

January 1, 1970

From the Harper wedding photobomb to the most retweeted photo ever, this slideshow takes a look at the most viral photos from 2012.

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