I no longer see the error. Thanks for resolving!
@limestreet what was the workaround you found?
These tags are intentionally added in the function fbc_get_comment_author() in wp-facebookconnect/fbconnect.php.
Regarding the <fb:name> tags, these are intentionally added in the function fbc_get_comment_author() in wp-facebookconnect/fbconnect.php.