Board Thread:Support Requests - Getting Technical/@comment-25024589-20150814012047/@comment-24930713-20150814020752

I think when it comes to licensing you're supposed to be as specific as possible. So adding the appropriate licensing tag, as well as saying from where and whom you got the image from. This page mentions it a bit, and expands on it a bit more here.

Edit: As for the image you linked, I would put it under fairuse, but list as much info about the image as I could. Like where I got it from - linking specifically to the post it was contained in, listing who is in the image, listing who originally uploaded the image to twitter or whatever website it was uploaded to, and possibly listing the website it was uploaded to.