1. Have you used facebook.com’s official wordpress plugin?
2. How easy is it for a visitor to leave comments on your blog using this plugin?
3. Does it permit you to remove Facebook facilitated blog comments from your wordpress blog if they contain inappropriate content (for purposes of your blog)?
PS: Do you know of a website that has this facebook authored comment posting functionality implemented so I can go test it and see how it works, from a poster’s perspective, in real life?