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Most retweeted Obama photo

As networks began calling the race for President Obama on election night, his campaign tweeted this photo with the caption “four more years.” The image became the most retweeted ever and “most liked” on Facebook. (@BarackObama/Twitter)

2012 Year in Review: Most viral photos

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