What you need to know on Wall Street today

Welcome to Finance Insider, Business Insider's summary of the top stories of the past 24 hours. Sign up here to get the best of Business Insider delivered direct to your inbox. The Federal Trade Commission (FTC) on Monday said that it is officially investigating Facebook. The FTC publicly confirmed the investigation after several news outlets reported on the probe last week, citing unnamed sources. Facebook stock was down as much as 5% following news of the FTC probe. Elsewhere...