Every time a user bookmarks a web page on a social bookmarking site, it results in a backlink to that website page. Backlinks are a crucial factor in Search engine optimization, as engines like google like Google use them to find out the relevance and authority of the website. https://www.seobyaxy.com/blog/how-to-build-backlinks-guest-blogging-reaching-out-to-competitors-and-more/