social bookmarking is like you can save links to web pages you like. you can organize these links with tags to easily find anytime. you can also share these bookmarks with others, making it simple for everyone to find interesting content.
Social bookmarking can get you some SEO benefits like indexing fast, google crawls some familiar social bookmarking sites often, so bookmarking your content might help to index faster and also it drives some good amount of traffic to your site, which is very helpful.