does openid work for the iusethis facebook app? I can't see how.

Congratulations getting openid to work. makes my life much easier. however, I can't work out how to use it for your facebook app. when install the facebook app it asks me for a username and password, which as an openid user i didn't have. well, in fact I linked a normal account to my openid, so now i do have an account, and that seems to work, but it seem to defeat the purpose of openid just a little.