The U.S. Federal Trade Commission is probing whether Facebook violated terms of a 2011 consent decree following the revelations that user data had been transferred to Cambridge Analytica without their knowledge, according to a person familiar with the matter.

Under the 2011 settlement, Facebook agreed to get user consent for certain changes to privacy settings as part of a settlement of federal charges that it deceived consumers and forced them to share more personal information than they intended. That complaint arose after the company changed some user settings without notifying its customers, according to an FTC statement at the time.