Facebook comment:

Google will index comments from sites using Facebook's comments plug-in
Move should see lively discussion sites benefit
Google also tweaking search so 'trending' results 'work faster'



Read more: http://www.dailymail.co.uk/sciencetech/article-2057640/Now-Googles-spiders-read-Facebook-comments.html#ixzz1cyVwuMMU




https://developers.facebook.com/docs/reference/plugins/comments/