Pleanty of people i know are engaged in commenting on other blogs irrespective of dofollow or nofollow, But now if you comment excessively you may face a ban hammer. As explained on official webmaster central blog,
It has probably happened to you: you’re reading articles or watching videos on the web, and you come across some unrelated, gibberish comments. You may wonder what this is all about. Some webmasters abuse other sites by exploiting their comment fields, posting tons of links that point back to the poster’s site in an attempt to boost their site’s ranking. Others might tweak this approach a bit by posting a generic comment (like “Nice site!”) with a commercial user name linking to their site.
Why is it bad?
FACT: Abusing comment fields of innocent sites is a bad and risky way of getting links to your site. If you choose to do so, you are tarnishing other people’s hard work and lowering the quality of the web, transforming a potentially good resource of additional information into a list of nonsense keywords.
FACT: Comment spammers are often trying to improve their site’s organic search ranking by creating dubious inbound links to their site. Google has an understanding of the link graph of the web, and has algorithmic ways of discovering those alterations and tackling them. At best, a link spammer might spend hours doing spammy linkdrops which would count for little or nothing because Google is pretty good at devaluing these types of links. Think of all the more productive things one could do with that time and energy that would provide much more value for one’s site in the long run.
Now a lot of webmaster communities are raising a question
What if I am a legit comment maker, I love engaging in the blog communities & i do add value to the content!
Well Google is yet to answer this question. So lets wait & watch!
In the mean time you may a nice article on how to make authentic comments by Harsh
http://www.shoutmeloud.com/how-you-should-comment-on-other-blogs.html
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Interesting read. I had a blog that had about 1000 spam comments and I really had no idea why. I changes some settings and started moderating comments and they have pretty much disappeared.
To many people are afraid of Google and forgetting about other search engines,and this is the main issue.
Second :to many things are called SPAM and we all know it’s definition.
Third:I personally approve “Spam” comments, but i do moderate and piss off the “pure spam”/posts with unreadable nonsense and only links in it.
I really don’t know about you,i personally dislike self-proclaimed authorities and “policeman’s” and the fact is with this kind of Google claims and us talking about it,we are practically giving Google a stick to beat us.