Two of the most popular Web 2.0 applications combine social
bookmarking and repositories: Delicious and YouTube. These
systems introduce a powerful new way of working with Internet
content. A typical social bookmarking/repository system allows
online storage and management of bookmarks/resources that can
be accessed anytime, anywhere, via any browser, and any Webenabled
device. Such systems enable bookmarks/resources to be
tagged by user-defined key words. The social dimensions of these
systems enable sharing of bookmarks/resources with others, as
well as ranking and engaging in an extended dialogue and
networking. Through exploring these social systems, a user can
locate relevant bookmarks and resources based not only on
personal pursuit, but also upon collective tags, specific user's
recommendations, and popularity. Rather than acting alone, a user