In the perfect world!
If done the right way, posting comments on blog posts is a great way to get high quality targeted links to your website. Most of us believe that to be true. Just about all blogs allow you to include a link to your website in the comment form thus giving you a backlink. However not all blogs are built the same.
Tips For Getting and Keeping Your Backlink
A big thing to keep in mind is to make sure you do not appear as a spammer. This is because most likely your comment will be deleted along with your time, effort and link. When leaving a comment make sure it is relevant and offers something productive. This will ensure your comment sticks thus ensuring your link does as well.
Tip For Maximizing Your Backlink’s Effectiveness for SEO
Unless you are trying to rank high for your name use a key word or short phrase instead of your name in “name” box of the comment form. What you inter in the “name” box becomes your anchor text and makes the link higher quality to the search engines. Keep it short though, no more than two words or it will look like blatant spam and may get deleted.
Also don’t be afraid of leaving a lengthy comment that has your key word or phase lightly sprinkled though out it. I have on more than one occasion found that one of my comments have turned up in the search results. This doesn’t necessarily increase the value of your link but does increase your links exposure to more potential visitors.