Look for footprints for blogs that allows you to leave comments with dofollow backlinks. It's not important how many links you have created. It is more important that you have 1 quality backlinks than to have thousands of spammed backlinks. Both blog commenting and bookmarking are essential in SEO, as long as your keywords are diversified and you use more generic keywords like "
visit this site" to index your backlinks, as well as your money site. So keep on doing what is more important and what google loves.