Traders are betting billions that the hottest stocks of 2017 will get crushed (FB, AAPL, AMZN, GOOG, NFLX)

Chip Somodevilla/Getty Facebook, Apple, Netflix, and Google are high up on the list of S&P 500 companies that investors added the most notional amount of short interest to this year. They're also among the most heavily shorted right now, according to S3 Partners, a data analytics firm. Short sellers defied the tech rally and increased bets for sell-offs even while they were losing money. The so-called FANGS — Facebook, Apple, Netflix, and Google — helped drive the S&P 500 to what's set to be...