neon

If you write something like “@nick, how are you?” this plugin will search for @nick’s url in the comment list of the current post and will convert his/her name to a link.

Twitter style links

This plugin allows you to add Twitter style links to comments.

kyleabaker

WP-TwitterBadge is a simple plugin that allows you to display a Twitter "Follow" Badge on your site or blog.
It uses the Twitter "Follow" Badge that is provided by <a href="http://www.go2web20.net/twitterFollowBadge/" rel="nofollow ugc">go2web20.net</a>. This plugin takes the hassel out of having to manually edit the details and enter it into your theme each time you change themes.
I’m providing this plugin as it is since this Twitter Badge is actually written and maintained by <a href="http://www.go2web20.net/twitterFollowBadge/" rel="nofollow ugc">go2web20.net</a>. However, I will be fixing bugs that are found in the plugin and updating with updates from <a href="http://www.go2web20.net/twitterFollowBadge/" rel="nofollow ugc">go2web20.net</a>. That being said, your feedback is very important!
I do not claim ownership of any part(s) of the included "badge.js" Javascript file as it belongs to <a href="http://www.go2web20.net/twitterFollowBadge/" rel="nofollow ugc">go2web20.net</a>. This javascript file is provided via this plugin as is and with no modification.
WP-TwitterBadge was written with Geany – <a href="http://www.geany.org/" rel="nofollow ugc">http://www.geany.org/</a>
<h3>Features</h3>
<ul>
<li>Twitter Badge displayed links to your Twitter account to invite visitors to also follow you on Twitter!</li>
<li>Your Twitter account name can be changed or adjusted easily via the options page if you decide to change accounts.</li>
<li>You can customize the label on the Twitter badge with four available options.</li>
<li>You can customize the color of the Twitter badge to any possible web safe color or use transparent so your background design shows through.</li>
<li>The color option also provides an easy color picker tool (thanks to the iColorPicker javascript tools).</li>
<li>You can customize the side of the page that you wish to display your Twitter Badge on.</li>
<li>You can customize how far down the page your Twitter Badge should appear.</li>
</ul>

WP-TwitterBadge

WP-TwitterBadge is a simple plugin that allows you to display a Twitter "Follow" Badge on your site or blog.

Twitter style links vs WP-TwitterBadge