Facebook is popular social networking site if we promote or share any website or information it can be send to thousands or lakhs of people so visitors can find the required information easily and clearly within seconds.
Social bookmarking is also best method in SEO to get backlink and also promoting website.

Facebook is the most popular & widely used social platform.
Facebook & social bookmarking get huge visitors in your site and increase its popularity.

Facebook and social bookmarking both are very useful now a days, we can get huge visitors in site and increase its popularity.