micahwave

Automatically creates a <a href="http://bit.ly" rel="nofollow ugc">bit.ly</a> url for each of your posts when they get published. To display the shortened url, simple use <a href="https://codex.wordpress.org/Function_Reference/wp_get_shortlink" rel="nofollow ugc">wp_get_shortlink</a> in your template file.
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Bitly URL Generator

Automatically creates a bit.ly url for each of your posts when they get published.

corybohon

Tweetster is an Omeka and WordPress plugin that allows you to easily and automatically have new additions to your Omeka archive or WordPress blog tweeted out to your Twitter audience. This helps generate traffic to your site and keeps followers updated on what you are currently working on.
Tweetster is simple and efficient, and takes only a few minutes to set up. Here’s what you’ll need to get started with Tweetster: 
* WordPress 3.0 or higher; or Omeka version 1.0 or higher 
* Twitter Account 
* Bit.ly Account
More information, and installation guide available on http://corybohon.com/tweetster/
Tweetster for WordPress 
Written by Cory Bohon (http://corybohon.com)
///DOCUMENTATION///
Documentation and help files are available online at http://corybohon.com/tweetster. Please refer there for help on setting up Twitter API keys, Bit.ly information, and more.
///LICENSE///
The Tweetster plugin is distributed under the MIT license: http://www.opensource.org/licenses/mit-license.php
Copyright (c) 2010-2011 Cory Bohon.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
///SPECIAL NOTICES/// 
The tmhOAuth framework, used in this plugin, is under an Apache license. You can find more information about this framework here: https://github.com/themattharris/tmhOAuth

Tweetster

Automatically tweets title and link to newly published articles on any WordPress blog.

Bitly URL Generator vs Tweetster