Russell Aaron

Have you ever wanted to link directly to the lastest post in a post type / category, with out having to update your menu? Now you can use a #Hashtag inside of a custom menu item’s url. The custom menu item links to the latest post in a post type / category you choose.
Let’s say your readers want to only read the latest post in a category called news. You can create a #Hastag menu item and link them directly to the latest post in your category, straight from your menu.

Hashtag URL Placeholder

Create a #hastag linking to your latest post, in a post type or category.

Eduardo Reveles

Convert the following formats:
<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>
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.

Twitter Highlight

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

Hashtag URL Placeholder vs Twitter Highlight