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When Katie Miller went to Las Vegas this Thanksgiving, she tweeted about the lavish buffets and posted pictures of her seats at the aquatic spectacle "Le Rêve" at the Wynn Las Vegas hotel. A week later, the 25-year-old account executive at a public-relations firm got an email inviting her to a swanky holiday party on Manhattan's West Side. She read on to learn that she had been singled out as a "high-level influencer" by the event's sponsors, including the Venetian and Palazzo hotels in Las Vegas, and a tech company called Klout, which ranks people based on their influence in social-media circles.
