Facebook’s single sign-on feature, dubbed Facebook Social Login, could have been used to log into victims’ accounts at third-party services and mobile apps. Facebook says it does not enforce its developer guidelines, it has no way to force a single sign off for breached accounts. Facebook breach is a warning sign for anyone who might use consumer SSO services offered by Facebook, Google, Twitter and other providers. Password managers are a good thing, but SSO is a security and privacy concern for a number of reasons.”]
Source: https://www.govinfosecurity.com/blogs/experts-view-avoid-social-networks-single-sign-on-p-2670