[Plugin: fbConnect] Anonymous Spam Comments

I Have fbConnect installed on my site. Very few other plugins installed. Askimet is installed. It does catch all the porn spam that i have been getting.

But my question is, HOW am i still getting this spam when registration is required. And you have to have a Facebook account in order to gain access to comment.

All the comments left are as if they left an anonymous comment, no email or anything.

Where do I have a security hole at do you think?

https://www.plasmaburn.net is my website. Thanks in advance.