[Plugin: Simple Facebook Connect] Login with Facebook but post anonymously

Hello,
I would like to create a forum where the user needs to create an account or login with Facebook in order to be able to post, but where they can make the post anonymously (though I as admin would know which user it is in case they spam and I need to block them). Is there a way to do that with this plugin and do you recommend any plugin in particular for the forum itself?
Jonathon

https://www.ads-software.com/extend/plugins/simple-facebook-connect/