Check this website to know how to write effective blog commenting http://www.seohosting.com/blog/link-strategies/effective-blog-commenting-to-increase-page-rank/
I've found it useful and it helps you meet others within your niche, who knows they may give you a link if you become a regular.
IMHO if you reply very fast to a prominent blog post with a highly relevant comment, you will surely get lots of referral clicks. But in terms of Ranking it has close to zero relevance for your site! Decide whether it is worth it your effort.
This is insanely NOT true, blog commenting is honestly the best link building strategy you can use. I have used strictly link building for my new website and I've gone from PR0 to PR3 in one PR update. Blog Commenting is the god of link building, do not dis it and really try to become good at it because the payoffs are HUGE.
Blog posting is better than just commenting on posts. Again that depends on the kind of blog you are posting or commenting on.
Yes, Blog comment is effective these days. you need to comment relevent blog you need to comment on dofollow blog
Commenting on blogs is one of the better ways to build inbound links to your website.. Thanks for share this information and mybe it can be useful
Effective for what? You need to be a bit more clearer...what are you trying to acheive through Blogging?
Recently blog commenting in a effective way will the improve the over all optimization of the website!