Social bookmarking is one of the effective techniques of off-page SEO, it is a most effective way to establish viral web presence or internet promotion of your web page, article, blog post or any important link. This makes your website visible to your targeted local and global audience.

Benefits of social bookmarking

  • Optimizing Outside of Web Page
  • Proper Dofollow Backlinks
  • Increase in Rankings
  • Generate Traffic

Here is the list of top 101 social bookmarking sites
Top 101 Dofollow Social Bookmarking Sites for Effective Link Building 2012