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Kevin Rose officially relaunching Digg.com
(www.youtube.com)
This is a most excellent place for technology news and articles.
As far as centralized servers go I've always liked tildes.net as a reddit alternative.
Briefly joined Discuit during the Reddit API ruckus but I was already on Lemmy so I never stuck with it. It's been open sourced and the people seemed mostly pleasant so it seemed like it was on a reasonable path towards creating a good space.