Information diffusion, particularly information diffusion in social systems, is a form of communication inside and outside collective organisms or supra organisms. Information diffusion has an almost fluid like dynamic, particularly in very large systems or networks. Modeling information diffusion in biological and social systems has the power of revealing a fundamental property of living systems - how a system, subsystem or individual changes, adapts or selects its behavior and can be transformed into an an entirely new entity or phenomenon. Additionally, understanding information dynamics can help understand how systems and phenomena transform themselves and evolve. Information diffusion models can be incredibly simple (flows) or incredibly complex (swarming behavior, network propagation), depending on the nature of both the system and the information.