Time was, companies knew how to keep track of their important customers. First, they set up loyalty programs: computerised systems that tracked the monetary value of everyone who shopped in their stores or flew on their planes or ate at their restaurant. When a high spender made a booking, the company was alerted to their status and they were treated accordingly

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NSFW: Cherchez la fame – or why the media’s obsession with Twitter campaigns will make customer service smell French