So, what I want to see is some data so that we can decide if we need to do something about the sheer volume of comments we get. I have been able to use a SEDE inquiry to get info about the number of comments that currently exist on each post... or at least existed the last time the SEDE query ran - MondaySunday the 21st27th - as of right now the site reports that we have 377394 questions and 17391822 answers, so the info is but these numbers are a bit out-of-datewonky. If I have time on Monday, I'll tryThis has been updated since the first posting to update everything below so that it matchesreflect a more nicely with some of the "right now" datarecent SEDE query.
The majority of answers have no comments - 744931 vs 683844 for a total of 14271775 answers but they add up to 21932863 total comments on answers. So, this represents about 1.56 comments per answer, though if you exclude answers with zero comments, you get a little over 3 comments per answer.
Most of the questions have comments, though - 4145 vs 277337 for a total of 318482. This is probably expected. We want to help people improve their questions, which requires comments. In total, there were 16622045 comments on questions the last time SEDE ran. This means that, on average questions get a little over 54 comments each or exactlya little over six per question if you exclude those with zero.
While this doesn't sound too bad, there are 1658 questions and 938 answers with ten or more comments each - up to 2629 comments on a single questionpost.
That's a total of 38554908 comments on 17452208 posts (2.2022/post) since this site went into public beta. I don't know if this is completely out of line but it seems somewhat high. Computer Science Educators, a site that is at 9495 days in beta has 39643985 total comments on 18751970 posts (2.1102/post). Bioinformatics has 20872158 comments on 11721223 posts (1.7876/post) after 104105 days in beta.
I can add a little bit of light to that. As a moderator, I can see a count of total moderator-deleted comments (includes CM deletions). That number is 13521544 (as of right now, not when SEDE ran). You read that right. In two months, we have deleted over 13001500 comments - or about 2324.5 per day. Compare that to the total from the SEDE query, that's about 1/3 of the existing comments, so about one in four comments ever posted on this site have been deleted by a moderator (there's some fudging in there because it's been so long since SEDE ran).