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Twitter is a service for friends, family, and co–workers to communicate and stay connected through the exchange of quick, frequent answers to one simple question: What are you doing?     Why? Because even basic updates are meaningful to family members, friends, or colleagues—especially when they’re timely. Eating soup? Research shows that moms want to know. Running late to a meeting? Your co–workers might find that useful. Partying? Your friends may want to join you.     With Twitter, you can stay hyper–connected to your friends and always know what they’re doing. Or, you can stop following them any time. You...