Everyone knows how to sing "Happy Birthday to You." But performing the song in movies or on TV requires payment of sometimes hefty licensing fees. Now the song is at the heart of a lawsuit. iStockphoto hide caption

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Facebook co-founder and CEO Mark Zuckerberg told James Bennet, editor in chief of The Atlantic, in September that he wasn't worried about whether Facebook is "cool." "We're almost 10 years old, and we're definitely not a niche thing at this point," Zuckerberg said. Win McNamee/Getty Images hide caption

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