A social bookmarking service is a centralized online service which enables users to add, annotate, edit, and share bookmarks of web documents
These are the step to use a social Bookmarking Services
Set up your account on each social bookmarking site; this will include a public user name, password and maybe a website as part of your profile.
Download the buttons. These are typically available to all users so that you can add them to your blog or website and encourage other visitors to bookmark your posts.
Create your lists. You can arrange lists of specific information for each submission. This will help you keep everything organized and makes it much easier to share information with niche groups.
Submit a URL link to the site and fill out the description box, tags, keywords and subject, if needed. This is how you "index" your articles, posts and submissions.
Continue submitting URLs through the system and categorizing them accordingly to build your list. Provide valuable content at all times so you are not labeled as a spammer.
Start networking. Branch out to other people in the community who have created lists with similar topics and keywords. This is how you can start promoting your list and URLs, and it helps you become an active user.
Visit your major sites every day. Maintaining a steady level of activity makes it easier to find quality information and connect with other users.