Best Facebook Login Plugin But Don't Show Real Name?

Hi, what is the best Facebook login plugin that after logging in it does not reveal the user’s real name?

I want all new users to my website to sign up and log in via Facebook, then ask them to register with an alias. Each time when the user comes to my website, they need to log in via Facebook, and once that is successful, my website will never disclose their real names publically but instead it shows the aliases they register with.

Thanks

[No bumping. If it’s that urgent, consider hiring someone.]