Leaving comments on other blogs is one way of getting backlinks and traffic to your own blog, and it’s super easy to do, which is why it is often exploited by spammers and other deceitful people. So you have to be careful to closely moderate the comments on your blog(s) and when you are leaving comments on other blogs make sure you are leaving something that is well thought out, useful, and relevant to the topic.
If you leave useful comments, you would not only get backlinks, but you can even get targeted traffic to your blog. It is important to leave relevant comments on blogs that add something legitimate to the discussion so that your comments will be approved on the blog to achieve the backlinks and traffic. If you just post comments like “nice tips” or “This is an interesting article” or you just try to leave your links — the blog owner will probably not approve your comments.
I have when someone leaves misleading or vague comments because it is annoying and adds nothing of value to my posts. I once had a commenter that left a comment that said that I have an interesting blog and he just subscribed to my feed. I was happy with that comment because someone just subscribed to my feed without me telling the person to subscribe. The next day, I saw the same exact comment on another one of my blogs. I don’t know how he found that blog, but I assume he probably uses some sort of automated tool so post comments on hundreds of blogs that he ever actually reads. When I saw that comment, I knew that I was deceived. I always moderate the comments on my blog posts, so I deleted his comment on this blog and on the other blog.
If you want to receive the benefits of commenting, you should leave useful comments. By useful comments, I mean that you should read the blog post and comment accordingly. I can tell by reading someone’s comment if the person read or did not read a blog post. Don’t let people call you a spammer because spammers don’t read blog posts. They just copy and paste the same words on every blog they come across. If you leave useful comments, you will attract other blog readers to your blog. The readers would be curious about what your blog is about and what type of posts do you have on your blog since you are leaving quality comments on other posts they read. If you have what they are looking for, they might become regular readers and might subscribe to your feed, or buy from you.