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If you want to add plugin for Facebook, Twitter, LinkedIn, Google, Yahoo than can try
[http://wordpress.org/extend/plugins/loginradius-for-wordpress/](Social Login for Wordpress)
[http://extensions.joomla.org/extensions/social-web/authentication-cloud-based/19293](Social Login for Joomla)
[http://addons.oscommerce.com/info/8306](Social Login for osCommerce)
Above all plugins allow login from Facebook, Twitter, LinkedIn, Google, Yahoo and more in one platform using OpenID and OAuth.