Now that I've made my way through the Infinite Dick Parade that was the reports queue this morning:
You MUST use the sensitive-image overlay if you post an NSFW image to the public timelines.
You are not required to do so, but PLEASE tag the image in some other way to let people know what the content of the sensitive image is.
Also, PLEASE use a CW (just "NSFW" is fine) if you're going to use graphic terms to describe the image.
(Hashtags in the CW text don't work. Hashtags UNDER a CW do.)