Sorry to necro my old thread, but I finally figured this out and thought the solution might help someone else. It's pretty simple, but not very obvious. When copying a link from imgur, it links to an actual *webpage* rather than the image itself. So it isn't rendered inline. The solution is to just open the imgur page (in your own web browser) then right click on the image and select "Copy image link" (or similar.) When you paste that into your post, make sure to add the image tags.

Applying that technique to the above image we get...

[Linked Image from i.imgur.com]