With https://imgur.com/r/$SUBREDDIT/rss you have a image feed for a specific subreddit. I love to see images directly in my feed reader. No need to click on Reddit links and open browser.
example URL https://imgur.com/r/trashy/rss
All those feeds stopped updating two days ago 21.07.2016. Is this a temporally problem or did Imgur discontinue those feeds?
The global feed (top voted stuff) still works and gets updated frequently. Hosted by Feedburner.
Best Answer
Those feeds were down for a week. Now working fine. I didn't find any background info about this downtime in Imgur Blog under tag #Engineering. There seems to be only funny GIFs and images.