paul1999

This plugin blocks your blog from being accessed by the DiggBar. This message is displayed to the user:
The DiggBar is blocked on this blog. <a href="http://daringfireball.net/2009/04/how_to_block_the_diggbar" rel="nofollow ugc">Read why</a>.
<h4>Credits</h4>
Digg blocking php code by <a href="http://daringfireball.net/2009/04/how_to_block_the_diggbar" rel="nofollow ugc">John Gruber</a>.

Block Diggbar

This plugin blocks your blog from being accessed by the DiggBar.

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).

Block Diggbar vs Recommended Links for WordPress