FACEBOOK did some spiffy Web magic a few months back that allows people to post comments, using their Facebook identities, on any sites which are set up to accept them. And these comments show up as news feed stories on those users' walls and on their friends' home pages.
My blog comment provider, Disqus, has apparently been setting up the Facebook Connect feature to work since the start of the year. I just tweaked some of my Disqus settings to enable it on my blog. Now waiting for the blue Facebook Connect button to show up above my comments boxes. Hope it works!