Rewarding commentators/commenters with steem blockchain dollars (SBDs) through upvotes, in my opinion, is a beautiful way to engage and build communities on the steem blockchain.
Credit source
When someone comes to make a comment that adds value (not spam) on your blog post, I think the nicest thing to do is to reward the person, no matter how little. One cent (0.01 SBD) is better than nothing. The 1 cent and more which you distribute to those who comment, when comments are upvoted, usually goes to the steem reward pool and paid out to authors of comments after 7 days. Please, screen shot below of distribution of stake by the steem blockchain (steem reward pool) in the last 30 days.
Image source: steemdb.com created by witness
This act of benevolence by Steemians who contribute by curating content (including comments) is appreciated. It is a major contribution to the proof-of brain (POB) algorithm clearly stated and explained on page 1 in the steem bluepaper. That 7-paged steem bluepaper is a MUST READ!
Since I joined planet steem 7 months ago, I have been known as one who likes to incentivize my fans by voting on not just posts alone, but their comments as well, based on my judgement of how much value they contribute to the community. I vote on comments, not because I am compelled to, but because I consider it very important to encourage discussion around the theme, which has been presented by content creators. The content you have created is as important as the comments. Believe it or not, many people may only peruse your beautiful post, especially when the content is too long or incomprehensible. I know for sure that when some visit to read blog posts, they only do so to read comments. More so, many only go to the comment section and see how people are commenting and make their contributions based on those comments. I do that , sometimes, especially when I do not have the time to read a very long post. My contribution to the steem reward pool is beginning to pay off. I am so excited about the new accolade that I got yesterday and the day before as one of the top 80 and top 100 curators of comments in the steem community. Please read entire post.
Top 80 Effective Steemit Curators Who Encourage Discussion (19/10/2017)
I like statistics, maybe because my father is a mathematician and statistician. So, I look out for statistics and try to understand as well as analyze numerical data. My affinity for numerical data made me come across 2 interesting posts, authored by 
I want to share with you statistics about the most effective Steemit curators.
This statistic is not about how much the authors or curators have earned. This statistics shows the list of curators, whose contribution to the reward pool distribution is the most significant. Read more from source.
Source: https://steemit.com/bisteemit/@boddhisattva/top-80-effective-steemit-surators-that-encourage-discussion-for-the-2017-10-19
Below is a screen shot of An Excerpt Of Top 80 curator of comments (19/10/2017)
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From the screenshot above, it is seen that 
A second post I read from the same author, 
Summarily, I think rewarding commentators and their comments is a good way to engage and build communities.
APPRECIATION
My sincere appreciation goes to all who contribute to the steem reward pool for comments, especially those whose names feature among the top 100. Please, let's continue in this light to encourage community building. Thank you.
ANNOUNCEMENT
Fifty (50) steem has been transfered to 
Transport fare for 
----------------- 20 Steem
------------------ 4 Steem
------------------ 5 Steem
------------------ 5 SBD
Do you vote/curate fellow Steemians comments or just your comments only? Please share in the comments section.
Please, let us head to 
UPVOTE***RESTEEM***COMMENT***SHARE