Under the terms of those deals, which the Times reported about in June, Facebook allowed device makers including Apple, Amazon, and Microsoft to access personal user data, including friend lists, contact information, and sometimes even private messages - and not always with the user's consent, the report alleged.
Manufacturers of mobile devices got an especially sweet deal, according to internal Facebook documents seen by the Times.
Facebook is already entangled in a criminal investigation into the Cambridge Analytica scandal, in which political consultants used its systems to improperly harvest data from 87 million people.
The company has been juggling a number of scandals and investigations since the Cambridge Analytica revelations almost a year ago. "We've provided public testimony, answered questions and pledged that we will continue to do so".
The probe constitutes a sharp escalation of Facebook's legal problems in the U.S., where it is under scrutiny from four separate government agencies, including the United States justice department, as well as from legislators.
Facebook's data sharing deals are coming under hard scrutiny by American federal investigators.
The deals sparked outrage - and have come under sharp scrutiny - since they were revealed in a investigation by the Times past year.
The Justice Department didn't immediately respond to a request for comment. Facebook has said the partnerships were well-publicized at the time, and that it has since shut majority down.