I took a look at the first result that popped up (http://www.nytimes.com/2015/03/26/world/europe/germanwings-airbus-crash.html?_r=0 http://www.nytimes.com/2015/

I took a look at the first result that popped up (http://www.nytimes.com/2015/03/26/world/europe/germanwings-airbus-crash.html?_r=0 http://www.nytimes.com/2015/03/26/world/europe/germanwings-a...) and interestingly, this ad_sensitivity tag is set to "tragedy". I'm curious to know what other options there are now - whether this is boolean, or a sliding scale.