Which page rank will i get from blog commenting?

[Argyles]

This used to really help your page rankings, but it's not soo much anymore. Oscar is correct, you want to first make sure that the blog allows engines to follow the comments. Keep in mind that the days of being able to spam your website all over the place are over. Blog comments are important, but keep in mind that it should be relevant to your site. You can check backlink profiles and see if this site is even worth it with tools like majesticseo or the Mozbar.

If I come across a blog that has good content and related to the site I'm working on, I contact the writers.
Most of the time they were hobby writers and I actually was able to give them content and got links from them. It was really minimal work for me and if I sent them some minor promotional item they were super happy with it. It also depends on what industry or what you're trying to promote.