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Stoob

This plugin adds voting functionality for posts. This function is similar to Reddit or Digg, in that visitors can vote for and against.
Guests can also vote for posts. This functionality can be disabled as well.
A widget can be displayed showing the most voted posts on your blog, giving further exposure to your popular posts.
A brief summary of what the plugin has to offer:
<ul>
<li>Visitors can vote for your posts, if they are allowed to</li>
<li>Easy management of post votes</li>
<li>Two-way voting: People can vote for or against your posts if feature is enabled</li>
<li>Post authors can be barred from voting their own posts</li>
<li>Initial vote count feature enables the voting of posts the moment they were published</li>
<li>Fairly customizable features</li>
<li>Top voted post widget gives greater exposure of posts your readers like</li>
</ul>
<h3>Requirements</h3>
<ol>
<li>
A working WordPress install
</li>
<li>
WordPress theme must contain a call to the <code>get_header()</code> function
</li>
<li>
WordPress theme must contain the WordPress loop
</li>
</ol>
Most WordPress installs have these, so you need not worry about these.
In addition, one must have JavaScript enabled in their browsers in order to vote.
WordPress 2.8 or above is recommended for this plugin.
<h3>Customizing</h3>
Votingfunctions.php
Within <code>votingfunctions.php</code>, there are several functions that can shows other information.
<pre><code>GetVotes($post_ID): Returns the number of votes associated with the post.

UserVoted($post_ID, $user_ID): Returns TRUE if the user already voted for the post, FALSE if the user hasn't voted for the post

GetPostVotes($post_ID): Returns an array of user IDs that have voted for the post.

GetPostSinks($post_ID): Returns an array of user IDs that have voted against the post.

SortVotes(): Returns an array of post IDs and votes. The array is sorted with the post having the most votes at the top of the array.
</code></pre>

Vote It Up

The Vote It Up plugin enables visitors to vote for and against posts.

brandontreb

TwitPop is a WordPress plugin with one goal…To make you more popular on Twitter. There are sites that spring up from time to time claiming to get you more followers on Twitter if you follow X amount of people on the follow train. Well, now you can create your own Twitter train on your wordpress blog and really get more followers.
The best part is, you add your username in the admin panel and EVERYONE FOLLOWS YOU! Think of the possibilities… You could be a Twitlebrity.
To add to the excitement, everyone that uses your TwitPop plugin will Tweet a link back to your blog. This promotes your blog as well as your Twitter account.
What are you waiting for? Click the download button now.

TwitPop

Gain more followings on Twitter by creating your own follow train.

Vote It Up vs TwitPop