Nolongeractive

The plugin picks out twitter usernames and hashtags and automatically converts them to working links to Twitter profiles and search pages. You will no longer have to manually create these links, it will happen automatically for all page, post and comment content.

Automatic Twitter Links

This plugin automatically converts Twitter usernames and hashtags to Twitter profile- and searchlinks in pages, posts and comments.

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!

Automatic Twitter Links vs Twitter Hashtag Blaster