GOOGLE openID

Blogger previously allowed users to comment on blogs using an existing third party OpenID identity provider and has also acted as an OpenID identity provider when interacting with other systems on the internet. Due to the low usage of this feature, Blogger will no longer support OpenID as a provider or for making comments, and all comments that previously used OpenID will be anonymized. New comments can be posted either from a Google account or labeled as “Anonymous” on blogs that allow it.