All eyes on Wall Street were focused on Facebook Inc FB 1.43%Monday after reports that data from more than 50 million users was improperly shared during the 2016 campaign season. The news sent Facebook’s FANG peers tumbling as well, perhaps on fears that their data-driven businesses could soon be threatened by harsher regulations. What Happened? Cambridge University professor Aleksandr Kogan reportedly shared user data collected by his Facebook personality test app with Cambridge Analytica, a company that worked to develop social media ads for the Trump campaign. Kogan wasn't authorized by Facebook to share the data, which Facebook believed had been destroyed. Source