Earlier quoted context omitted.
Well, it sounds like they did eventually cut his access, so that's one measure. Presumably they relied on Facebook having his real name in order to know who he was, though it's also possible that they have some stenographic watermarking.
> they have some stenographic watermarking They did. Right before access was cut, a code was watermarked on the TV, I assume it was per-box as a number so they knew who it was to cut access to.
Just really fascinated with the technicals of how they'd do that.