View-source shows that it's used for images in tags. <img src="//i.stack.imgur.c... | Hacker News

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Godel_unicode on Feb 10, 2016 | parent | context | favorite | on: Why Stack Overflow Doesn’t Care About Ad Blockers

View-source shows that it's used for images in tags.

  <img src="//i.stack.imgur.com/tKsDb.png" height="16" width="18" alt="" class="sponsor-tag-img">

JeremyBanks on Feb 10, 2016 [–]

More significantly, it's the official host for all user-uploaded images on the site.

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