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They're new. http://www.google.com/search?q=site%3Anews.ycombinator.com#sclient=psy&hl=en&source=hp&q=site:news.ycombinator.com+green+usernames&fp=a1ec93dfb69ea

• yuhong 15y ago
  I often use it to tell whether an Ask HN uses a throwaway account or not.
• sirwitti 15y ago
  oh, thanks a lot!