WordPress.org

This plugin allows users to use social networks accounts to leave comments.

Supported social networks and OpenID providers:

• Google
• Google+
• Facebook
• Twitter
• Vkontakte
• Mail.ru
• Odnoklassniki
• Yandex
• Rambler
• Yahoo
• MyOpenID
• Live Journal
• Flickr
• WordPress
• Blogger
• Verisign

Cackle Features

• Threaded comments and replies
• Notifications and reply by email
• Share on Vkontakte, Mail.ru, Facebook, Twitter
• Anonymous commenting
• Powerful admin tools
• Ban by IP, User
• Bad words filter
• Additional moderators
• Easy to install