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Re:Ask HN: What percentage of your users are using social lo... by dstroot on Saturday March 24, 2018 @01:14PM (#16667617)
>Websites using Facebook login usually don't ask for any of your Facebook information, just your email address.

This is absolutely false. FB delivers a whole profile.

Re:Ask HN: What percentage of your users are using social lo... by alangpierce on Saturday March 24, 2018 @02:56PM (#16668194)
Presumably you're just referring to the public profile? Public profiles can already be accessed for any user without their agreement (at least manually), so it's not extra information provided through FB login. See my second sentence for that caveat.