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Apple sells 50 million iPhones for the quarter. Facebook closes in on 2 billion subscribers. And MercadoLibre does its best Amazon impression. Plus, best-selling author and New York Times journalist Charles Duhigg talks American Express, Chase, and the battle to be your credit card. Thanks to Slack for supporting The Motley Fool. Learn more at slack.com.     Learn more about your ad choices. Visit megaphone.fm/adchoices