I would like the option to select a rectangular area in the image editor, and blur it. This way I could easily blur faces and car license plates when I edit my uploaded photos.
Imgur uses Aviary for the advanced editing. If it doesn't have a blur option then there's nothing I can do :( However, there's a rectangle option, so you could just black it out instead.
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There still doesn't appear to be an exact "blur" option, but you are able to use the "Blemish" brush (Edit Image > Advanced > Blemish) for pretty much the same effect.