Free online promotion also includes posting on forums. But you also have to make sure that your intent is not obvious. Meaning, do not spam the forums. Internet forum etiquette calls for hanging out at the forum for a little while, reading posts from past, and answer relevant to the asked issues. This will attract members to react more positively to your free promotion.

Writing articles on your website niche is also very effective way for free advertising. If you write your own articles or pay an article writer to write your articles for you, you get enough exposure  in exchange for the reprint use of your article. The resource boxes at the bottom of the article pages does it for you.

There are many other ways to promote your website free of cost, like social bookmarking and blog commenting. But these few ways last a longer impression and get you targetted traffic.

Feel free to share your free advertising methods.