Here are some major points will definitely help you to understand the flow of bookmarking and how it can help you to gain more traffic:
1.Understand how to utilize your own keys
2.You should make things easy for your visitors to bookmark your site
3.Bookmark swapping / You should bookmark your pages
4.Stay greatly involved in social bookmarking site
5.Your page should have outstanding content on it
Re: Key Points to Remember for Social Bookmarking
Here is my only advice for people doing some social bookmarking for their own websites. ALWAYS read the website's rules and regulations as most of the times, it is stated there on how you can get the best out of those sites and how you can avoid being banned.