Today I received a Facebook developer alert stating that the Facebook login button does not comply with Facebook platform policies. After some conversation, Facebook tells me that the button found on Auth0 login page (with is the default login page using Lock) isn’t compliant with Facebook Platform Policies. I am asked to change the button to the one found at their doc: https://developers.facebook.com/docs/facebook-login/best-practices#buttondesign
Although I managed to finish modifying the style of Facebook login button (with dirty CSS overrides), I think this issue will impact all Auth0 applications as long as they use the default login theme (Lock). Maybe we should modify Lock’s Facebook button style to the one that complies to Facebook’s policy?
My modification is now under Facebook’s review. I will update the post with my button design if Facebook says that my modification is acceptable.