Digg.com is similar to StumpleUpon in that users can add your site to their "list" of sites, stories, videos or podcasts that they like. Digg also displays the number of people who Digg the same article. The main focus for digg is news items.

Read the StumbleUpon post on how to add a link for that Social Network.

Again, the basics for adding digg:
visit this page: http://digg.com/tools/integrate
In the most simple form, you copy the text that looks like this:
<script src="http://digg.com/tools/diggthis.js" originalAttribute="src" originalPath=""http://digg.com/tools/diggthis.js"" originalAttribute="src" originalPath=""http://digg.com/tools/diggthis.js"" type="text/javascript"></script>

To get a result like this:

There are several other options that will let you customise the way this looks and works.
 Good Luck and Happy Digging!

Brendan Byrne