Updated at 4:10 p.m. ET
A data-sharing scandal and privacy concerns appear to be taking a toll on Facebook.
Its stock dropped nearly 20 percent Thursday — a day after the company released earnings showing that its user growth has stalled and told investors that it expects revenue growth to slow for the rest of the year.
With a loss of more than $100 billion in its value, the social media giant had one of its worst trading days.