Ashley

Naked Social Share allows you to insert plain, unstyled social share buttons for Twitter, Facebook, Pinterest, StumbleUpon, and Google+ after each post. The icons come with no styling, so that you — the designer — can style the buttons to match your theme.
There are a few simple options in the settings panel:
<ul>
<li>Load default styles – This includes a simple stylesheet that applies a few bare minimum styles to the buttons.</li>
<li>Load Font Awesome – Naked Social Share uses Font Awesome for the social share icons.</li>
<li>Disable JavaScript – There is a small amount of JavaScript used to make the buttons open in a new popup window when clicked.</li>
<li>Automatically add buttons – You can opt to automatically add the social icons below blog posts or pages.</li>
<li>Twitter handle – Add your Twitter handle to include a “via @YourHandle” message in the Tweet.</li>
<li>Social media sites – Change the order the buttons appear in and disable any you don’t want.</li>
</ul>
If you want to display the icons manually in your theme, do so by placing this code inside your theme file where you want the icons to appear:
<pre><code><?php naked_social_share_buttons(); ?>
</code></pre>

Naked Social Share

Very excellent, simple plugin. I dislike all the others with the loud styles.
Here's some jQuery to have a title show.
$('.nss-google a').attr("title", "Share on Google Plus");
        $('.nss-linkedin a').attr("title", "Share on Linkedin");
        $('.nss-twitter a').attr("title", "Share on Twitter");
        $('.nss-facebook a').attr("title", "Share on Facebook");
        $('.nss-pinterest a').attr("title", "Share on Pinterest");
        $('.nss-stumbleupon a').attr("title", "Share on StumbleUpon");


Very nice and clean

Simple, unstyled social share icons for theme designers.

johnlawrence

PopuList allows you to track the popularity of your posts on social bookmarking sites reddit, stumbleupon, del.icio.us and digg. When PopuList is activated, a page is added to your dashboard giving the number of times a page has been saved or upvoted.
New in version 1.5 PopuList now also lets you view backlinks as indexed by Google and Yahoo.

Populist

Track the popularity of your posts on social bookmarking sites reddit, stumbleupon, del.icio.us and digg

Naked Social Share vs Populist