Graphic or iconic is a popular method of enveloping a hypertext link. However, do not automatically assume that users will see and instantaneously understand graphic or icon symbology the same way as you intended. Annotation is a virtue, do exercise whenever necessary. People do not complain on detailness but do complain on ambiguity. The concept of a chunk of information must be flexible, and consistent with common sense, logical organization, and the convenience of the users.
Few users spend time reading long passages of text on-screen.
Most users will save long documents to disk, or print them, rather than read extensive material online. A link that produces only a small paragraph of information would be silly in most situations. Concise chunks of information are better suited to the computer screen, which provides a only limited view of long documents. Very long web pages tend to be disorienting, because they require the user to scroll long distances, and to remember the organization of things that have scrolled off-screen. Once you have determined a logical set of priorities, you can build a hierarchy from the most important or most general concepts, down to the most specific or optional topics.