Blog and Forum commenting are effective link building techniques as always but we should have to make post on relevant forums and blogs. Also we should have to vary keywords while we are making anchor text.

No, I don't think so.................Blog commenting is used to improve website link popularity. Blog commenting is a good way to exchange thoughts and opinions about certain topic written as a blog post.

No not at all.Its a very good way to create back links.

I don't think so
Blog Commenting is also an another off page SEO activity for website promotion. It is a very good source of diverse links back to your site. Blog commenting simply to put your views on related article or post. Blog commenting really helps you to increase your web traffic and rankings as well.

Many blogs allow a space at the end of each post for a blog reader to leave a comment. The blog commenting field usually asks for the name of the commenter, their email address, and their website. The blog commenting space is important because it adds an interactive element to the blog. Readers can share their thoughts on the topic and start a discussion with the blogger. Blog commenting is a popular online marketing strategy. Blog commenting is also a link building tactic, since the comment links back to the page that was submitted in the “Website” field. Blog commenting should not be done only for link building, but it is an added advantage.

Blog Commenting will help you to generate more backlinks

Blog commenting is best way to get back links.

Blog commenting is the best way to share your knowledge also you can ask your queries. The best benefits of blog commenting is getting back link. Every web master looking for back link through blog commenting.

no this is wrong information ... if you submit the comments relevant sites so it's not dangerous.

It depends on those who comments on a blog. If someone give non relevant comment on a blog post, you can consider it as spam. In this sense yes comment spam is there. If you are a genuine reader, comments have to be relevant to the blog post.

If you spam blogs, then it is not good. Make good replies that offer beneficial information and your ok.

I think there are other mistake in your work, blog commenting may be nofollow but i think that may be not showing spamming.

Blog commenting is depend on keywords related theme. Blog commenting is good or not bad.

blog commenting should be relevent with your subject, it would help you to improve ranking.
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Yes.when you post i relevant post or start relevant topic against the post then Google consider your link as spam.Be relevant to the post and give proper ans to the people than Google will give importance to your site.