Comment with Facebook

I started to use BOLT instead Pivotx and we nee a way to allow comments from registered users,
but of course its much better if users can comment without long registration.
Is there a way to do that?
And where can i find the list of Bolt extensions?
but of course its much better if users can comment without long registration.
Is there a way to do that?
And where can i find the list of Bolt extensions?