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This plugin allows you to add authentication using social media networks (Twitter, WordPress, Google+, etc.) for the users who want to comment on your blog. 
The plugin can be activated to provide authentication for all posts or only for selected posts. 
The usage of this plugin does not oblige you to create an account on our website, like others plugins do. 
All you need is to have an account (if you don’t have one, then you must create it) on the social network that you want to use as a source of authentication.
<h3>Configuration</h3>
To configure the plugin, you must follow the instructions described here: http://www.ixtendo.com/comments-with-social-login-wp-plugin/

Comments with Social Login

Add authentication using social media networks (Twitter, WordPress, Google+, etc.) for blog comments

devu

Instead of manually update your Facebook status / Fan Page Wall / Twitter with every new post you publish on your blog, this plugin does it for you.
The plugin requires Php4 or higher, Curl and Json libraries.
<h3>Arbitrary section</h3>
More information & support: http://www.francesco-castaldo.com/plugins-and-widgets/fb-status-updater/

Status Updater

If you have a Facebook profile or page or a Twitter account, this plugin is what you need to connect them with your blog! When you publish a new wordp …

Comments with Social Login vs Status Updater