I figure these days that posting your link in a comment section, isn't very viable anymore. The reason I think this, is because I think most sites block it. I know some blogs/sites allow you to enter a site along with your name/email so that when people click on your name, it sends them to your site. So I have in the past looked for those types of sites, and I always make a general comment on the article. This way, it also creates a sort of backlink for my site, and I'm not spamming to do it. But, I think most sites these days require a sign-in.