takien

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.
<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.

zackproser

The Twitter Hashtag Blaster enables your readers to send your content into Twitter conversations surrounding your target hashtag.
Do you run a humor website? Set your hashtag to #lol and start enjoying increased traffic from Twitter. Is your content about #football? #programming? #fashion? #politics? You can target any hashtag you like.
Once installed and activated, go to Settings -> Twitter Hashtag Blaster.
Here you can enter your target hashtag and choose whether the button should be small or large.

Twitter Hashtag Blaster

Add Twitter hashtag buttons at the end of every post, for any hashtag you want. Sends shortlinks to your articles into Twitter!

Hashtag vs Twitter Hashtag Blaster