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The best stories across the web on media and technology, curated by Lily Leung1. Facebook stock slides below $20 (CNNMoney) 2. Study: Most-watched news videos on YouTube depict natural disasters or political upheaval (Pew) 3. How social media may have affected an important MLB trade (Poynter) 4. Is pay TV really shrinking? (AllThingsD) 5. Huffington Post's tablet mag.