
Tag My Hash (#TagMyHash) is a lightweight WordPress plugin that bridges social-media-style hashtag usage with WordPress’s native tag taxonomy. This plugin scans your post content, identifies anything starting with a pound (a.k.a. hashtags sign #), and turns it into a functional part of your site’s tag structure. You no longer have to manually scroll down to the “Tags” meta box every time you want to categorise a quick update. A live front-end demo of this plugin can be found @ LornaTimbah.com.
Features:
– Automatic hashtag detection in post content
– Auto-create missing WordPress tags
– Auto-assign hashtags as tags on save
– Convert hashtags into clickable links to tag archive pages
– Simple settings page (enable/disable + mode toggle)
– Standard Posts support
Caveat
When you save your post, the hashtag will be rendered as a link, based on your Permalink’s Tag base.
If you change your permalink’s Tag base, the hashtag will NOT update itself. You’ll have to edit your post and re-save it, for the Tag My Hash to render the tag links again.
A tool will be created in the next update, which will help re-render the hashtags whenever your Tag base changes.
Screenshots

Example front-end (posts) with Tag My Hash enabled.

Tag My Hash settings page in WordPress dashboard.