Facebook Inc. said on Friday it has suspended tens of thousands of apps on the social networking platform, as part of the company's ongoing app developer investigation began in March 2018 in response to the Cambridge Analytica row.

The suspended apps are associated with about 400 developers, Facebook said, adding that it is not necessarily an indication that these apps were posing a threat to users.

Earlier this year, the company agreed to pay a record-breaking five-billion-U.S.-dollar fine to the U.S. Federal Trade Commission (FTC) to resolve a government probe into its privacy practices.

The FTC privacy probe was triggered last year by allegations that Facebook violated a 2012 consent decree and inappropriately shared information of 87 million users with British political consulting firm Cambridge Analytica.

Facebook has since agreed to boost safeguards on user data and has put curbs on the amount of information that third-party developers can request from platform users.

"... We're making progress. We won't catch everything, and some of what we do catch will be with help from others outside Facebook," the company said in a blogpost.