Facebook Comments – How to Find All Facebook Comments on External Websites

Register your domain to insights and see what you get. (Takes about a day to collect the data)

http://www.facebook.com/insights/

I wish I could vet this for you but the site I currently administer is currently down. I will update and test the moment I get it back up.

For Example, The Facebook Page though for the domain shows

• Likes
  • Daily New Likes
  • Daily Active Users
• Interactions
  • Daily Post Views
  • Daily Post Feedback

You can also just inspect the pages themselves in the case of the like button

https://graph.facebook.com/?ids=http://www.imdb.com/title/tt1375666/ This gives the object info for the Inception Movie from IMDB

{
   "http://www.imdb.com/title/tt1375666/": {
      "id": "110935752279118",
      "name": "Inception (2010)",
      "picture": "http://profile.ak.fbcdn.net/hprofile-ak-snc4/hs275.snc3/23312_110935752279118_3281_s.jpg",
      "link": "http://www.imdb.com/title/tt1375666/",
      "category": "Movie",
      "description": "Directed by Christopher Nolan.  With Leonardo DiCaprio, Joseph Gordon-Levitt, Ellen Page. In a world where technology exists to enter the human mind through dream invasion, a highly skilled thief is given a final chance at redemption which involves executing his toughest job till date, Inception. Visit IMDb for Photos, Showtimes, Cast, Crew, Reviews, Plot Summary, Comments, Discussions, Taglines, Trailers, Posters, Fan Sites",
      "fan_count": 22285
   }
}

The activity feed will take care of displaying stories both when users like content on your site and when users share content from your site back to Facebook. The Like Box is just an aggregation of Likes. Login Button and Friends Pile share the same display functionality.

I am not sure how the Live Stream operates have not had an event to test it with yet.

There's a new app available on Android that does this called Exfoliate. It exhaustively goes through all your friend's walls and deletes posts, comments, and likes.