Delicious

Delicious is a social web service for storing, sharing, and discovering web bookmarks. Delicious has a "hotlist" on it's home page and "popular" and "recent" pages, which help to make the website a conveyor of Internet memes and trends. It's collective nature makes it possible to view bookmarks added by other users. Use of Delicious is free. 

We can access it from this address: http://delicious.com/