You can “click login” to Google, Yahoo! (US), myOpenID, mixi, and you can also specify any other OpenID by clicking “OpenID” button. I tried with my XRI “=nat” and it still works unlike some other sites.
Having been working on Digital Identity since 2000.
Co-author of various identity related specifications like OpenID Connect, JSON Web Token.
Chair of the OpenID Foundation (2011-)
Vice Chair of the OpenID Foundation (2010),
Founder of OpenID Foundation Japan (2008-),
Trustee of Kantara Initiative (2009-).