I looked at the comments of private_messaging, and it looks like someone is mass downvoting him (I initially noticed this when I noticed this comment replying to me was downvoted for no obvious reason). I decided to experiment by giving him a compensatory mass upvote. So far I upvoted what is currently the first page of his comment history (from here to here in his comment history; amongst these this was already upvoted by me for independent reasons). However, it looks like the mass downvote went farther. I suggest anyone who agrees with me that private_message received a mass-downvote to continue for me the compensatory mass upvote and publicly declare which posts they upvoted to avoid double-counting. I also suggest that people say what they think about compensatory mass upvotes in general.