Social bookmarking task

I am looking for a freelancer who can help me with a social bookmarking task. The goal of this task is to boost my website's search engine rankings. I am open to suggestions for specific websites or platforms to use, but I also have a list of my own that can be utilized. I am looking to have more than 20 bookmarks created. Ideal skills and experience for this job include proficiency in social bookmarking techniques and knowledge of how to improve search engine rankings.