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
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Since the very first MTV Video Music Awards 31 years ago in 1984, the show has always provided memorable moments. Ahead of the 2015 edition, set for Aug. 30, check out some of the most memorable.