takien

<p>Use hashtag on WordPress just like on Twitter or Facebook. Word preceded with hash automatically converted into clickable link. If clicked it will search contents contain same hashtag.</p>
<h4>Features</h4>
<ul>
<li>Use standard hashtag ( #hashtag )</li>
<li>Customizable CSS</li>
<li>Hashtag also can be used for regular search</li>
<li>Hash on color code, URL and unicode will be skipped</li>
<li>Supports for non latin characters</li>
</ul>


Hashtag

Use hashtag on WordPress just like on Twitter or Facebook. Word preceded with hash automatically converted into clickable link.

Eduardo Reveles

<p>Convert the following formats:</p>
<ul>
<li>@username -> http://twitter.com/username</li>
<li>@username/listname -> http://twitter.com/username/listname</li>
<li>#hashtag -> http://search.twitter.com/search?q=%23hashtag</li>
</ul>
<p>It comes with some options to configure, like use nofollow attribute, open on a new page and choose where you want the links to be replaced.</p>


Twitter Highlight

Convert twitter usernames, hashtags and lists in pages, posts or comments to a twitter link.

Hashtag vs Twitter Highlight