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As 2012 comes to a close, top social sites are remembering the year that was. On Twitter, President Barack Obama's "Four more years" tweet became the most popular post of the year—and of the 6-year-old site's history—with more than 760,000 retweets
Click here to read Bob's blog.
Frank Micelotta/Getty Images
The Beatles hit No. 1 for the first time in America, tragedy strikes space…
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