Comments

This may be an obvious question, but better safe than sorry.

If an article is published on my site with a possibility to comment the article on facebook, will the comments be syncronised between facebook and the joomla site?
Will the comments-field on the joomla site be a part of this extention, or do i have to install another plugin to be able to comment both on my site and on facebook?

Best regards
Asbjørn Paulsen