This plugin helps integrate your blogs twittering into Piwik (http://www.piwik.org) more tightly. Whenever you post a blog entry and Twitter Tools tweets your post, this plugin will add a “piwik_campaign=twitter” to your post’s url and then shorten it. This way, you can keep track better of the visits that come to your site following your tweets.
This plugin builds on Alex King’s Twitter-Tools plugin (https://wordpress.org/extend/plugins/twitter-tools/) and does not work without it.

Twitter Tools – Piwik Campaign Tagger

This plugin adds a "piwik_campaign=twitter" to the URL that is published by Twitter-Tools and then shortens it using bit.ly.

roggie

Twitter Tools is great but currently lacks a simple function to send a Tweet from your site’s PHP. This plugin adds such a function, so you can send a Tweet by calling the function from your site’s PHP.
<a href="http://www.thehypervisor.com/really-simple-tweet/" rel="nofollow ugc">Changelog</a>
<a href="http://www.facebook.com/home.php?sk=lf#!/pages/The-Hypervisor/114689115238103" rel="nofollow ugc">Follow me on Facebook</a href></a>
<a href="http://twitter.com/thehypervisor" rel="nofollow ugc">Follow me on Twitter</a href></a>

Really Simple Tweet

Adds simple function to send a tweet. Accepts Twitter username and password as parameters, or gets them from Twitter Tools if available.

Twitter Tools – Piwik Campaign Tagger vs Really Simple Tweet