Jim Cramer discussed Under Armour (UA), Facebook (FB), Amazon (AMZN), and Alphabet (GOOG) from the floor of the New York Stock Exchange on Thursday. Following Under Armour’s strong earnings reports, Cramer spoke highly of the company’s CEO, Kevin Plank, saying ‘don’t bet against him.’ A viewer asked Cramer whether to buy stock of Amazon ahead of its earnings report. Cramer said Amazon probably had a huge holiday season, but of the FANG stocks, Alphabet is currently the cheapest. Cramer also discussed Salesforce.com (CRM) and Freeport McMoran (FCX). Jim Cramer is the portfolio manager of Action Alerts PLUS and host of CNBC’s ‘Mad Money.’ Send your questions to Cramer on his Facebook page, or on Twitter (TWTR), using hashtag CramerQ.