Any blogger reading right now has no doubt bristled like an angry cat at the headline. Blog comments promoting a site immediately suggests comment spam. Well, that’s just what we’re saying: don’t spam! But anybody with a blog that allows comments has seen comments that work, which contribute to the discussion, and then the URL in the comment is tolerated.
The basic method is that you search Technoratti or Google BlogSearch to find blogs in your topic space or niche. Then go there and hopefully leave a comment that won’t get deleted, with a link back to your site.
The important thing is that you make participating in that blog’s community your first priority. Helpfully point out a mistake, add a note and a link pointing out some other aspect of the subject of the post, answer a question posed by another commenter, or even just mention that you also covered another view of this topic on your own blog.
One important strategy that is often overlooked: the sites that already link to you! Whenever a blogger links your site as a reference and you notice some traffic coming from it, go there and leave a comment thanking them for the link… and also fill in your site’s URL in the appropriate field. There, now you have two links, from a site that likes you already! You can also add a link back on your own site, thanking the blogger for mentioning you and pointing your readers to that site for commentary on your subject.
This is how the blogosphere builds friendships.
The important thing is to be a good web citizen above all else. Spam your link to irrelevant sites, or worse yet, hire a third-world freelancer to do it, and you’re heading for trouble and ill will all around. Further tips on blog comment marketing here.