Delicious

"Delicious is a social bookmarking service that allows users to tag, save, manage and share web pages from a centralized source. With emphasis on the power of the community, Delicious greatly improves how people discover, remember and share on the Internet." http://delicious.com/drbexl http://delicious.com/sfdo

Digg

"Digg is a place for people to discover and share content from anywhere on the web. From the biggest online destinations to the most obscure blog, Digg surfaces the best stuff as voted on by our users. You won’t find editors at Digg — we’re here to provide a place…

Reddit

"reddit is a source for what's new and popular online. vote on links that you like or dislike and help decide what's popular, or submit your own!" Reddit is fairly high on my list of bookmarking sites to properly get the hang of, as I only added one link to…