So you wanna tweet? Great—you're gonna (mostly) love it. Everyone from the President to Malala is tweeting it up these days, but it may take some getting used to if you're a new kid on the block. Twitter is where news is broken, links are shared, and memes are born. It's also a place for chatting with friends. Yet unlike Facebook, Twitter is public by default. And that's not a bad thing.

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