ON THIS LINK

Google Friend Connect provides simple user authentication using any OpenID account, including Google, Yahoo and AIM. Instead of filling in yet another profile form, your users can connect to their existing identities, showing current profile pictures. By making login easier and connected to existing identity, you'll see increased engagement and comment activity. The Google Friend Connect plugins are proof-of-concept code to integrate users with external accounts into your site. A user can visit your site and leave a comment with a Google Account, Yahoo Account, any OpenID, or in future other sites that participate in OpenSocial. See separate instructions for the WordPressPlugin, DrupalPlugin and PhpbbPlugin