Because current digg isn't the old digg.
It's a thing where you ~~upvote~~ digg stories with a facebook/twitter account, and you can't make comments.
also all of the old digg links might be dead.
Also the closest thing new digg has to subreddit is tags
http://digg.com/tag/technology
You can click expand tags to see all of them.
Here's a tl;dr version of why everything on digg is different now.
haha, good one! I just peeked at a snapshot of digg from over ten years ago, http://web.archive.org/web/20070214221845/http://www.digg.com/ it brought back memories!
Digg was pretty awesome before the exodus after the v4 calamity. I don't know who the genius was that decided to abandon their format for a "magazine-type" format of sponsored posts, yuck!
There are some interesting charts here: http://www.alexa.com/siteinfo/digg.com+reddit.com
(Click on Traffic Stats, and Pageviews)
Notice a huge dip in Digg's traffic around 5-6 months ago? I "wonder" what that could have been?! There was certainly an implosion of some sort...