What is Social Bookmarking?
     Social bookmarking is submitting your website to social bookmarking site.Web users can visit social bookmarking to get the latest updates of the websites they have bookmarked to. Social bookmarking helps users to get the information they want about their favourite topics in one place.Also whenever you update anything about your website or launch a new product they get the updates if you post that update on social bookmarking sites.In this manner the user gets the information he wants to & you get a backlink from the top social bookmarking site as well as your audience gets diverted to your website.
     So social bookmarking is a great way to improve the traffic to your website as well increase your SERP status.