Earlier quoted context omitted.
Vox was launched in early 2014 and has seen blistering traffic growth since. Given that they were able to grow so rapidly in an already saturated news media environment dominated by Washington Post, Time, CNN, WSJ, and New York Times, suggests they are doing something right.
Indeed they are; Vox has improved the Q factor of the left wing echo chamber like nothing since the rise of huffpo.
One could measure the decay time of conspiracy theories through number of articles/posts published to determine the Q.
Or one could try to determine the bandwidth, as the allowed deviation from orthodoxy - a high Q chamber would have everyone parroting the exact same thing, whereas a low Q chamber would admit significant variability. Seems harder to quantify this measure though.
Also no reason to assume those two measures would be consistent. Needs a more rigorous approach to ensure self-consistency.