I have heard that blob commenting is not considered by Google due to lots of comment spam, is it correct, shown't we build links using blog comments..
Ya blog commenting is a best way to get a good back link to your website .There are so many blogs to get good back link .
Depends on various factors. Number of comments on the blog/article page. If done correctly, it can boost your page rank effectively. PM me if you want high pr blog comments.
Blog commenting mostly give no follow backlinks but it is the best way to get backlinks even gud traffic , the most important thing is by blog commenting you can create your network and interact with other people , and you can approach to them for your product/services of your site .
Yes, blog commenting in nofollow or dofollow sites are always beneficial. In case of fofollow you will get the back-link as well as in nofollow case at-lest your site will be crawl by the crawler.
Yes blog commenting is still effective , by that you could get connect with other people who r in queue of comment and you can also approach them for your product/services , and keep your knowledge increase .
Ya blog commenting is effective and very useful to get quality backlinks but always choose the blogs according to your site theme.
I do not think blog comments are not effective..By Blog Comments you will get quality backlinks and it also help in your website exposure and relevant visitors traffic towards your website...