Ethical
Commenting is a great way to drive traffic back to your blog and network with other bloggers. In fact, that is ALL it does. Links in comments do not affect your search engine rankings, as 99.99% of them will not be seen by Google (it’s called “no-follow” and it’s code your blog automatically adds into links placed into the comments). By commenting, I have met many wonderful people online, and I’ve been hired as a blog consultant by people who read my comments on other blogs.
Commenting on other blogs causes comments on your blog, too. If your comment really stands out, people get curious about who you are and they visit your blog. This is ethical and how it’s supposed to go. It’s a great way to meet people online. Before all this social media stuff started happening, blogs were (and are) a form of social media because of comments. You have to approach commenting like you do blogging: be real, say something worthwhile, provide value.
Unethical
Automated spamming of comments is the bane of the blogosphere. Paying people to leave comments for your blog on other blogs is unethical. Search keywords in the name box of comments is a hallmark of comment spam, which means that you shouldn’t use them that way, either. Just use your name. If your comment is interesting enough, people will click to see who you are. You don’t want to do anything that even appears similar to spam tactics. Another tactic that will make you look like a spammer is leaving lots of short, worthless comments that aren’t interesting just to get your link out there. If your comment isn’t interesting, nobody’s going to click on your link, so what’s the point of that? Spammers leave comments like “Nice Post, I’ll read it for later saving thanks!” Your comments should not sound anything like that.
Links in Comments?
Is it okay to ever leave links in a comment? Yes! But… HARDLY EVER. On the slim chance that your link would add to what’s going on with the post and the comments, and if you can do it so that you don’t look like you’re just using someone else’s blog as your own personal advertising space, then go for it. Do it and be bold about it. Otherwise, JUST DON’T. If you have any doubt, don’t do it. Just leave the best comment you can that adds value to the conversation and gets people curious about you. That’s all you need to do.