One powerful feature of social networking is allowing visitors to your site or blog to share your content with their peers. A powerful way to sell something is to have someone recommend it to another person they trust, and this logic can be incorporated into your blog using a plug-in called Facebook Comments for WordPress.
Example Of Facebook Comment Box
This plugin provides a custom comment field that allows site visitors to comment on your blog posts using their Facebook profile. It also makes use of Facebook’s new Social Graph plugins, which allows you to monitor and track connections.
While the author’s site contains detailed documentation and FAQ resources, installing the plug-in is straightforward and configuration is painless. Just install as normal then go to settings -> Facebook Comments to configure. You’ll probably need to follow the instructions to configure the API keys, but this is a one-time process and takes only a few minutes to complete. I left all the other features the same and hit “save”.
What I liked
The “Like” feature is integrated by default. This is a simple way for people to interact with the content, and encourages social sharing. Great!
“Post to profile” box is checked by default. When a visitor submits a comment, the comment and a link back to your page is posted as an update on their wall. That’s powerful!
A Few Things I Wasn’t Crazy About
It’s worth noting I could be missing something in the configuration as I just skimmed the documentation, but a few things just didn’t roll out as I’d have liked. From an end user’s perspective, there is no option to post a message unless you’re already logged into Facebook. This isn’t a deal breaker, but I read somewhere that you could login using an email address and would like to enable that feature. An administrator can enable anonymous submission but that’s a spam party waiting to happen.
Also, the plugin doesn’t combine current post comments. This one seems to be a big disconnect. I understand the “why”, but if you have a blog that currently has a lot of comments, you may try to figure out some way to import them, display both or say good bye to all your comments.
Another unexpected challenge I encountered… using Facebook comments renders other comment plugins useless. Any plug-ins that supported or interacted with the default comment functionality will by bypassed when using this new plug-in. So make sure you disable them to cut down on resource usage.
All in all, I’ve decided the added functionality outweighs the cons and I’ve officially switched this blog to use Facebook comments – for now. I’ll be monitoring this change to see how it affects things, but as long as the comment spam doesn’t become an issue (knock on wood) and nothing unforeseen pops up, I’m confident it will be a permanent change. *Edit – you can keep your default comments as well as the Facebook comments. Check out Facebook Comments for WordPress in action below. 
Thanks for the great advice. This looks really useful.