I have an empty Facebook account with a pseudonym--the name of a fictional character, so it's actually obvious--and gmail address I don't use for anything. I se

I have an empty Facebook account with a pseudonym--the name of a fictional character, so it's actually obvious--and gmail address I don't use for anything. I set this up specifically to use with sites that use 'social' login. I've had it for a few years now, and as far as I can tell FB does not care.