8. The system of claim 7 , wherein the graphical user interface module is operable to present the shared terms by displaying each of the shared terms as a tag in a shared-tag tag cloud in addition to the multiple tag clouds.
7. The system of claim 6 , wherein the graphical user interface module is further operable to identify one or more shared terms that are commonly used in two or more term graphs associate with respective two or more group Gs, present the shared terms, and link, for each of the shared terms, a shared term to a tag in the tag clouds that represents a same term as the shared term.