renemanqueros

Allows users to log in to WordPress using Google+ or Facebook. 
Adds a configuration panel under Settings where users can set API keys. 
Upon successful login, depending on the service, users will be redirected to either:
— www.mywebsite.com/facebookcallback/ 
— www.mywebsite.com/googlecallback/
<ul>
<li>Trailing slash is mandatory. 
After that the user will be sent to the destination url set in the Settings panel.</li>
</ul>
<h3>Theming</h3>
Both links have a common CSS class: “gp_sociallogin”. 
Google’s login link has a specific class: “google”. 
Facebook’s login link has a specific class: “facebook”.

GP social login

Allows users to log in to Wordpress using Google+ or Facebook.

360crest

Nerd social share button is a set of very simple and light weight social buttons, it doesnt use javascript not images, all it uses is font, and just has no load weight to your website/blog like other share buttons does.
There’s an option to show the buttons on posts and pages. You can also put the buttons anywhere in your template using this template tag:
<pre><code><?php nerd_social_share_tag(); ?> </code></pre>
You can also display using this shortcode in single posts and pages:
<pre><code>[nerd-social] </code></pre>
Please note that these buttons do not show share counts. The essence of the whole thing is to keep it very simplified.
The only button that requires a little snippet of JS to work is the Pinterest button but this does not slow down your site in anyway. A demo of the plugin can be seen here: http://shoutershub.com/

nerd Simple Share Buttons

Simple Social Share buttons, no Javascript, no image, just css and fonts

GP social login vs nerd Simple Share Buttons