Alon,
Not really sure exactly what you're looking for. JFBConnect has the comment module for Facebook. If you want to use another comment system, JFBConnect creates completely normal Joomla user's that any extension can use though.. so if you want to use something else, you should be able to use it with users that login through Facebook just fine.
Hope that helps, but if you have other questions, just let us know,
Alex
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