[Rank Element] time to read/length [Description] the time spend reading a post divided by the length of it [Weighted Value] medium [Metric Base] ratio [Note] would require length of time data on post click through, reporting tools and disclosure [Information Available?] 
no
y e s
y e s t h e k i n d s a n d n u m b e r s o f c o m m e n t s o t h e r s m a k e o n a b l o g g e r s ' p o s t s
n o
h i g h
m a y b e