Facebook's stock, which already took a big hit last week, plunged as a result.
Facebook said in a statement on Monday that the company remains "strongly committed" to protecting people's information and that it welcomes the opportunity to answer the FTC's questions.
Trump-linked analytics firm Cambridge Analytica used stolen data, ex-employee says
News outlets have reported on the FTC investigation last week, but the FTC hadn't confirmed it until Monday. Facebook reached a settlement with the FTC in 2011 offering privacy assurances.
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