Top 21 because there is a tie.

LAST IMPROVEMENT: EXCLUDED a cat:-) and all comments on this post from @steempixels to avoid skewing the stats:
SteemPixels.com - Official Canvas
Actually, that seems to be quite fun. You may want to check it out but be patient if you do. It is going to take a long time to load before it has lots of comments. Probably the post with the most comment in steemit history. :-)

Note: Level 1 commenters are those who leave comment at the first level in reply to a post directly.

Here’s a look are the top level 1 commenters for 20171120. I’ve excluded known bots and curators from this but if anyone has any suggestions, they are most welcome. This serves to inform and you make you own decision whether they are the good, the bad or the ugly. I can only comment once every 20 seconds. Correction: I am only allowed to comment only once every 20 seconds. I type fast and sometimes get that annoying message quite a bit when responding and when I reply on my phone using voice typing, I get that even more. Anyway, 1,000 comments will need at least 333 minutes which is more than 5 and half hours. Hands up those of you who have spent more than 5 hours leaving comments at the first level.

🎶Meanwhile, some music for you to enjoy as you read. This piece is part of Vivaldi’s The Four Seasons, particular the first of the 4 violin concertos, called Winter.
🎶让大家继续读的时候，欣赏一点音乐。这件作品是维瓦尔第的“四季”的一部分 - 4小提琴协奏曲中的第一首，名为“冬天”。
Source | 来源: https://musopen.org/

Top 20 level 1 commenters and their active hours for 20171120

This shows the top 20 level 1 commenters and the number of level 1 comments posted at different hours of the day.

Top 20 Active

xxxx

A look at some of their comments

First 28 characters...

This is a list of comments from the above users which looks at the first 28 characters as similar comments and list of these similar comments that has occurred 10 or more times (ignoring those less than 10 times).

Commenter	First 28 characters	Count
@habib1978	`vai ami vote dilam apni ki a...`	155
@hiyo	`"https://media.giphy.com/med..."`	47
@hiyo	`"Welcome! https://media.giphy..."`	11
@pixresteemer	`[![pixresteemer_inco...`	168
@rabbi18	`"Nice post upvote and comment..."`	45
@rabbi18	`"Beautifull photography Than..."`	29
@rabbi18	`"Beautifull post Thanks For S..."`	13
@saluton	`Hello!...`	174

Middle 28 characters...

This is a list of comments from the above users which looks at the middle 28 characters as similar comments and list of these similar comments that has occurred 10 or more times (ignoring those less than 10 times).

Commenter	Middle 28 characters	Count
@good-chocolate	`... 11 lumines https://imgur.co...`	82
@good-chocolate	`...6 11 lumines https://steempi...`	10
@habib1978	`...in rihhan vai bolse, tahola ...`	112
@habib1978	`...ar modday post korte admin v...`	35
@pixresteemer	`"...potlights ..."`	168
@rabbi18	`"...ice post upvote and comment ..."`	45
@rabbi18	`"...aphy Thanks For Sharing up..."`	23
@rabbi18	`"...t Thanks For Sharing upvote..."`	13

Last 28 characters...

This is a list of comments from the above users which looks at the last 28 characters as similar comments and list of these similar comments that has occurred 10 or more times (ignoring those less than 10 times).

Commenter	Last 28 characters	Count
@good-chocolate	`...nes https://imgur.com/a/rgyt`	82
@good-chocolate	`...mines https://steempixels.co`	42
@habib1978	`...ttps://steemit.com/@habib197`	117
@habib1978	`...idha hobe. please don't mind`	35
@mdtusher123	`...ps://steemit.com/@mdtusher12`	103
@pixresteemer	`...resteemer/hi-there).`	169
@rabbi18	`"... post upvote and comment bac"`	45
@rabbi18	`"...ring upvote and comment bac"`	40