In July, NPR had 33 million site visitors; 491,000 comments were left by a sum of 19,400 commenters, or 0.06 percent of NPR’s visitors.
Looking during Jun and July, 4,300 commenters posted during slightest 145 comments each, accounting for 67 percent of all comments for those months.
For May, June, and Jul some-more than half of all comments came from 2600 commenters. Google estimates that 83 percent of NPR commenters are men.
Seems some-more like a class than a community.