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
More than two dozen City of Miami firefighters arrived at the Rickenbacker Causeway after a fellow firefighter apparently shot himself to death
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