I don't get it. Of course he's serious.

I am genuinely baffled by the people who think bubbled pictures are more NSFW than their unbubbled originals.

because if you are at 'work' or such environment that warrants the NSFW (Not Safe For Work) tag distinction and you click on a bubbled picture, it would give the illusion of viewing softcore pornography rather than, say, a typical bikini picture from a social networking site (which would arguably not be okay to view at work to being with).

Your mind fills in the gaps. What makes a picture NSFW is what it makes people think, not so much what it actually is.