The 'media'-as-a-singular-noun revolution rolls on!
“Media” as a mass noun, taking a singular the way “furniture” does, has reached Stage 5 on the Language-Change Index, Bryan A. Garner’s Modern American Usage says, meaning it is completely proper English. Garner does note, however, that “that usage still makes some squeamish.”
In fact, Perlman has been working this seam long before I showed up with my hammer and pick. Back in 2009, she wrote a piece about the de-Latinization of English in which she bet that media-as-a-plural-noun was probably on the wrong side of history: "If we asked a bunch of 'mediums' to look into the future, chances are they would see a singular victory."