LinksAlpha

Try the plugin at: http://sd.linksalpha.com
Shows links to your Social Networking profiles in a sidebar widget. Supported networks include:
<ol>
<li>Google +1</li>
<li>Facebook Like</li>
<li>Twitter button</li>
<li>LinkedIn </li>
<li>Pinterest</li>
<li>StumbleUpon</li>
<li>YouTube</li>
<li>About.me</li>
<li>Xing</li>
<li>foursquare</li>
<li>RSS</li>
</ol>
List of Features
<ul>
<li>Social Sharing Buttons.</li>
<li>Displays Social Buttons with count of activity.</li>
<li>Offers consistent UI: aligned buttons and uniform color selection.</li>
<li>Enables you to show links to your profile on 11 different Social Networks.</li>
<li>Automatically configure Facebook like and +1 button with your domain. </li>
</ul>
Manual positioning
For Manually positioning the Follow and Subscribe Sidebar Widget in your blog, place the below given code in the sidebar.php below div with id=”secondary” or any other file as you see appropriate in themes folder (…\wordpress\wp-content\themes). 
1. <code><?php lafs_widget_function();?></code>
Benefits
<ul>
<li>Automatic configured Facebook like and +1 button on your site/blog.</li>
<li>Keep your fans, followers, and connections automatically updated on your blog posts.</li>
<li>Expand your blog reach and save time.</li>
</ul>
Misc
<ul>
<li>For getting support, email us at: discuss@linksalpha.com</li>
<li>Note: We encourage you to download the latest version of the plugin as soon as it becomes available – as it may have additional extremely useful features for your blog.</li>
</ul>

Follow and Subscribe

Try the plugin at: http://sd.linksalpha.com

brehash

This plugin adds the official <a href="http://blog.twitter.com/2010/08/pushing-our-tweet-button.html" rel="nofollow ugc">Tweet Button</a> from Twitter to your Pages, Posts or Home Page. It lets your users share links directly from the page they’re on. When they click on the Tweet Button, a Tweet box will appear pre-populated with a shortened link that points to the item that they’re sharing.
This plugin is very customizable via ‘rsh-Tweet Button’ under the ‘Settings’ menu in WordPress Admin. Change the look and feel, pozition and where to seen of the button.

rsh-Tweet

Adds the official Tweet Button from Twitter.com.

Follow and Subscribe vs rsh-Tweet