And like Facebook, users can comment and have ongoing conversations about their agreement, disagreement, or progress with the experiences offered.

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Typically, someone who is in agreement with you will smile and nod as you speak. (Disagreement shows up in compressed or pursed lips, clenched jaw muscles, or a head turned slightly away, so eye contact becomes sidelong.) But smiles are often used as a polite response and to cover up other emotions.

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