1. Link to page using comment box: http://www.fidofriendly.com/contests/win-one-of-10-copies-of-disneys-treasure-buddies-dvds-from-fido-friendly-ma
   
   
2. This social plugin is for a website, not your fan page. Embed on a webpage users can comment on your post. Read below for an explanation of how that can be distributed further. 
   
   Distribution: Comments are easily shared with friends or with people who like your Page on Facebook. If a user leaves the “Post to Facebook” box checked when she posts a comment, a story appears on her friends’ News Feed indicating that she’s made a comment on your website, which will also link back to your site.
   
   Friends and people who like the Page can then respond to the discussion by liking or replying to the comment directly in the News Feed on Facebook or in the Comments Box on your site. Threads stay synced across Facebook and on the Comments Box on your site regardless of where the comment was made.
   
   
3. Moderation tools
   Admins can choose to make the default for new comments entered either “visible to everyone” or “has limited visibility” on the site (i.e., the comment is only visible to the commenter and their friends), to help mitigate irrelevant content.
   
   Admins can also blacklist words and ban users. If a new comment is published from a banned user or contains a blacklisted word, this comment will automatically have limited visibility.
   
   To moderate, you need to list yourself as an admin. To do this, simply include open graph meta tags on the URL specified as the href parameter of the plugin. 

To read further go to: https://developers.facebook.com/docs/reference/plugins/comments/

@andrea-vahl –thanks…:)