One of the concerns a lot of people express when they've decided to join Facebook is about protecting their privacy. Kids don't want their parents to see their party pictures; employees don't want their bosses to read their not-always-flattering comments about their companies; teachers don't want their students to know about their personal lives.
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Check out the blog of just about any hard-core Twitter evangelist and you'll probably find some variation of this statement: "I didn't 'get' Twitter at all at first, but now I LOVE it!"
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