I really wanted, though, for users to be able to comment on blog posts from inside Facebook, with their Facebook identities, and have it work like the OpenID comment plugin (in the sense that the user should not need to provide any authentication info, but it should be derived from their Facebook login).
I think I’ve finally got it it nailed, at least to the point where folks can start testing it.
If you are a Facebook user, go to this application page: http://apps.facebook.com/openparenthesis/
It will require you to log in (or already be logged in) to Facebook, but you don’t have to add the application to your profile or spam all your friends.
What you’ll see is my five most recent blog posts from this blog, inside a Facebook wrapper. (Can’t include embedded videos, the styles are bit wonked, etc – but it is a start. This is basically just Dave Lester’s plugin).
You should also (this is the new part I’ve hacked in) see the ability to comment on posts – without being asked for a name or url or email address.
Please leave me a comment to test it out. It should, if all works according to plan, pull your Facebook profile pic as your avatar for the comment as well – since your facebook profile page is actually an hCard with appropriate markup (go microformats!).
I believe this will work even for folks who are not “friends” of mine in facebook – but let me know if you run into difficulty.
Once I’ve validated that it works I’ll publish the code. It required me to add at least one file to my theme, and relies on the hAvatar plugin to get the profile pic.
Sometimes you’ll get the “You’re entering comments too fast” error – just wait 30 seconds. Unless lots of people are all trying to do it from facebook at once this should go away. I’ll need to figure out how to unthrottle the comment queue in wordpress for this point.