create files, folders, etc.
i use a hierarchical system
tagging is a way to tell the viewer what they are about to read or watch and what is involved in the video
social bookmarking is a system that bookmarks your favorite websites online instead of on your own browser this allows you to view it from any computer
the reason why these to systems are important is because it allows the users of the internet more freedom  to do what they want with their internet access