>> Shares of Facebook plunged on Monday, falling nearly 7%. That made it one of the big losers on a day when the key measures of the market took a beating, with the Dow falling more than 300 points. For Mark Zuckerberg, social media giant, the revelations that the personal information of 50 million of its users fell into the hands of a political consulting group connected to Donald Trump's presidential campaign were painful.
>> We have enough problems.>> The fall wiped out about $40 billion in the value of its shares, marking Facebook's worst day in more than three years. Shares of Apple, Amazon, Netflix and Google parent company Alphabet fell between one and a half in three percent. That dragged all the major US stock indexes into the red.
With the S&P and NASDAQ suffering their worst day in just over five weeks. Facebook's troubles aren't like to quickly disappear, on Monday Republic Senator John Kennedy joined fellow Democrat Minnesota senator Amy Klobuchar in calling on Facebook CEO Mark Zuckerberg to testify before Congress about data use. They also called for a hearing with the CEOs of Twitter and Alphabet, reflecting mounting concern in Washington about how companies share personal user data.