Facebook is very bad and nobody should trust them at this point.
https://www.facebook.com/policies/cookies/
https://www.facebook.com/help/111814505650678
https://www.facebook.com/legal/terms
https://www.facebook.com/about/privacy/
https://www.facebook.com/help/1561485474074139
now read all and tell me how you feel about facebook.
Cookies Policy
Learn more about Facebook's privacy policy and practices, including what types of info Facebook receives and how info is used and shared.
facebook.com