The tale of former CIA staffer Edward Snowden and a top-secret NSA surveillance program known as PRISM has captivated much of North America — and even spilled over into Europe — since the story first broke in June. While that frenzy of interest has raised all kinds of questions about national security, privacy and “access journalism,” it has also sharply boosted the profile of The Guardian, the British newspaper whose blogger-journalist, Glenn Greenwald, has led much of the reporting on the PRISM story and its aftermath.