xuxu.fr

Twitwi, another simple Twitter Connect for WordPress.
Only the basic :
<ul>
<li>Login with a Twitter account</li>
<li>Create a WordPress user</li>
<li>Save locally on the server the Twitter picture’s profile as an attachment</li>
<li>Shortcode or PHP Code to insert the Twitter Connect button wherever you want</li>
<li>Little widget for the sidebar</li>
</ul>
Page for the plugin : http://xuxu.fr/2013/12/30/twitwi-twitter-connect-basique-pour-wordpress/
You can help me buy some diapers ^_^ : http://goo.gl/SORljr

Twitwi

Another simple Twitter Connect for WordPress.

Louy Alakkad

GeePress, gives you all the tools you need to integrate your WordPress and Google+, including “Login with Google+” and “Comment via Google+”… Highly customizable and easy to use.
<h4>Key Features</h4>
<ul>
<li>Allow your visitors to comment using their Google+ accounts</li>
<li>Allow your blog users to sign in with their Google+ accounts. one click signin!</li>
<li>Easily customizable by theme authors.</li>
</ul>

GP – GeePress

All the tools you need to integrate your WordPress and Google+.

Twitwi vs GP – GeePress