I Don't Believe in Imaginary Property writes "The term NSFW is about to join the :( emoticon, going from a generic, oft-used internet abbreviation, to one company's exclusive trademark. Fark is seeking a trademark on the use of NSFW to describe naughty online content. Of course, they may face a bit of a battle because more than a few other people are already using the term NSFW to describe their products and services. Not that that's stopped anyone in the past." And, of course, the whole thing could be a big practical joke.