Ricardo Gonzalez

Twitter for WordPress displays yours latest tweets in your WordPress blog.
Features
<pre><code>* Simply
* Customizable
* Widget support
* No options page (yes, its a feature)
* Uses WordPress resources (no extra files needed)
* Detects URLs, e-mail address and @username replies
</code></pre>
Usage
If you use WordPress widgets, just drag the widget into your sidebar and configure. If widgets are not your thing, use the following code to display your public Twitter messages:
<pre><code><?php twitter_messages("username"); ?>
</code></pre>
For more info (options, customization, etc.) visit <a href="http://rick.jinlabs.com/code/twitter" title="Twitter for WordPress" rel="nofollow ugc">the plugin homepage</a>.
Customization
The plug in provides the following CSS classes:
<pre><code>* ul.twitter: the main ul (if list is activated)
* li.twitter-item: the ul items (if list is activated)
* p.twitter-message: each one of the paragraphs (if msgs > 1)
* .twitter-timestamp: the timestamp span class
* a.twitter-link: the tweet link class
* a.twitter-user: the @username reply link class
</code></pre>
<h3>Credits</h3>
<a href="http://cavemonkey50.com/" rel="nofollow ugc">Ronald Heft</a> – The plugin is highly based in his Pownce for WordPress, so the major part of the credits goes to him.
<a href="http://bohuco.net/blog" rel="nofollow ugc">Michael Feichtinger</a> – For the multi-widget feature.
Michael Voigt – #trendingtopics regexp
Allen Shaw – link’s regexp finetune
<h3>Contact</h3>
Suggestion, fixes, rants, congratulations, gifts et al to rick[at]jinlabs.com

Twitter for WordPress

Twitter for WordPress displays yours latest tweets in your WordPress blog.

utahta

This plugin inserts social share links at the top or bottom of each post. 
For theme developers, social share links can be added by PHP code or by using shortcode. Check documentation for this use-case.
This plugin documentation can be found <a href="https://github.com/utahta/WP-Social-Bookmarking-Light/wiki" rel="nofollow ugc">here</a>.
This is the list of used social sites:
<ul>
<li>Hatena</li>
<li>Facebook Like Button</li>
<li>Facebook Share Button</li>
<li>Facebook Send Button</li>
<li>Twitter</li>
<li>Tumblr</li>
<li>Google Bookmark</li>
<li>Google +1</li>
<li>Delicious</li>
<li>Digg</li>
<li>reddit</li>
<li>LinkedIn</li>
<li>Instapaper</li>
<li>StumbleUpon</li>
<li>mixi Check</li>
<li>mixi Like</li>
<li>GREE Social Feedback</li>
<li>atode (toread)</li>
<li>LINE</li>
<li>Pocket</li>
<li>Pinterest</li>
</ul>

WP Social Bookmarking Light

This plugin inserts social share links at the top or bottom of each post.

Twitter for WordPress vs WP Social Bookmarking Light