jfruh writes "Social networks like Twitter and Facebook have long hoped that the information they've gathered about you will help them create better targeted and more lucrative advertising, even though advertisers never see your personal data directly. But now Twitter is upping the ante, creating a new kind of card that encourages you to give your contact information directly to people who want to sell you things. For instance, Priceline has a new card with a 'sign up and save' button that saves you 10% on a hotel — and, though it isn't made explicit, adds your Twitter handle and contact information to a Priceline mailing list. There's nothing to stop Twitter from handing this info — including your phone number, if you've registered it with the service — to salesmen."
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