I am not particularly interested in the field of social networking authentication. But since I am eager to push the universal acceptance of WebID, I got very excited when I see this:

That is, I can use my WebID(FOAF ID, RDF URI, or whatever you call it) as my OpenID!! I guess this is a crazy hack and may have untrollable consequence, but I feel like you shouldn't have too many indirect identifiers for yourself. This is made possible by my .htaccess redirection recipe.

This unifies URI(WebID), URL(your hompage's URI), and OpenID into a single identification URI string. It is campatible with TimBL's position on httpRange-14, which states that a person is not a Web page and vice versa. This approach should also be compactible with FOAF+SSL.

Test Report:

• Logging into the sparqlbot Web site with my WebID as OpenID is fine.
• Failed to log into DIG's blog. Error Message: OpenID authentication failed: not a valid OpenID URL. I wonder what the reason is, did it do URL normalization?
• Successfully logged into SourceForge and took the picture above.