As far as I'm concerned, for comments, you either have a form for screen name and email, or you use Disqus. Facebook comments is not a good alternative. Other alternatives do not yet have as wide adoption as I would like.
On techcrunch I've seen both disqus and facebook. Lately, I've only seen facebook. Not sure why that is...and maybe I'm wrong for thinking I've seen disqus on their system. I really wish they'd drop facebook.
