Blog comments are really valuable?

If ones aim is to spam the comments then i think this is not good. Just think that after writing some good blog post and you have some comments from people who are linked to a website. They have left comments such as "Good Post" "Thanks for the information" and "Interesting Post " kind of comments then its a "spam".You need to start a conversation and really admire the blogger about your views on the blog post.

 

I believe it's useful when you know how to post and don't spam.

 

i agree do it manually dont spam. i do blog comments and forum comments takes a lot of time and work but will be worth it in the long runn.

 

Most blogs are nofollow by default though. Blog comments can help with SEO just make sure you don't spam and add relevant insight to the blog post.

 

blog commenting is such a difficult task...you will need to find related blogs and have your comments approved it not the best way to get backlinks

 

not only "dofollow" ,,,just comment on related niche (dofollow or not), google will chose...

 

If you are posting comments on nofollow blogs, it is quite meaningless as the return is neglectable. Considering the large amount of time and energy you spend on reading and commenting on posts, it is definitely not worth it, as nofollow links don't contribute to backlink building, though it may help attract some traffic if your comments are really interesting and can lead readers of other sites to check your own site.
Comments with dofollow links are more valuable, especially the ones on High PR Inner Pages, where the OBL is low. However, such pages are extremely hard to get.