Social Bookmarking sites are human edited search engines.You can find the list here : www.vmoptions.com/social-networking-list.php
Socialbookmarking is to add your site to sites like digg/stumbleupon etc etc... go to any of the social bookmarking site(google search will help) and make your account and submit your site..Don't do it in excess as it can lead to a ban.
Try to meet new people, join some of thier groups submit some of your articles. this will give you some traffic and your pages/links get indexed fast
Social Bookmarking refers to managing and tagging your bookmarks online and share with your friends and people online. its a very good source of back links and brings you quality traffic as well.
..."Social bookmarking is a method for Internet users to store, organize, search, and manage bookmarks of web pages on the Internet with the help of metadata."... http://en.wikipedia.org/wiki/Social_bookmarking
I think that "someone" which you mentioned, refers to the list of social bookmarking sites available in this forum. This is just one such thread that contains a comprehensive list.