akrabat

The DiggBar is a URL shortening service that puts your website within a frame on digg.com. As a result, the user sees Digg’s URL, rather than your URL in their address bar, no matter which page they navigate to on your site. You can see an example DiggBar URL that points to google.com: <a href="http://digg.com/http://google.com" rel="nofollow ugc">http://digg.com/http://google.com</a> which is automatically converted to <a href="http://digg.com/d1nYVs" rel="nofollow ugc">http://digg.com/d1nYVs</a>.
The No DiggBar WordPress plugin automatically redirects anyone using the DiggBar service, so that your site’s URL is displayed in the address bar of the browser.

No DiggBar

This plugin redirects DiggBar users to your actual site.

goldenapples

This plugin aims to support community link-sharing, social bookmarking, and discussion of links in the WordPress environment.
This is still at an early stage of what I hope will be a much more ambitious project. If you want to try this out, please give me feedback.
I will guarantee backwards compatibility with all data saved by the plugin, so it should be safe to install and activate, and as I add features, your existing posts and links will work with them just fine.
See the plugin’s <a href="https://github.com/goldenapples/recommended-links/wiki" rel="nofollow ugc">wiki page on github</a> for more up-to-date documentation (its hard to keep documentation updated in multiple places).

No DiggBar vs Recommended Links for WordPress