What Are Advantage And Use Of Facebook Comment Box

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When a user decides to leave a comment at your blog using the FB comments box, he has the option to post or not to post the same comment on his Facebook profile.
POST A COMMENT
If chooses the option the this is how your Post appears on his profile,
    
One  visitor can also click the "Like" link under another visitor's comment. This way your Posts are circulated widely over Facebook which is the largest Social media network with 500 Million active users.
Your visitors no more needs to log into blogger or create an open ID. They can comment using either their FB ID, Hotmail, AOL or Yahoo. Almost every online user in the world uses at least one of these services. So you visitors are provided with multiple options to post their comments.

facebook-comment-box 
 Your readers no more need to feel neglected because you no more need to reply them all at once. Rather you can pay them proper attention by replying to each reader under their comments.

You will get more relevant comments with no spam as users will have to use their personal IDs to leave a comment and spam robots are surely incapable of doing that. Blogger comment form to delete a comment you need to click the trash icon and the you are taken to a separate window where you select the option of deleting the comment permanently. But With FB comment box you Delete comments just the way you delete comments on your FB profileThe links left on your comment box are by default tagged as nofollow and according to the FB developers search engine robots can not crawl the content of your comments as the plugin is enclosed inside a iframe where robots can not enter to crawl data

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