RELOCATION DIFFUSION: When people immigrate from country to country—or simply move from the country to the city—they often share cultural traditions and practices with their new community when they arrive., , CONTAGIOUS DIFFUSION: Infectious diseases (cholera, aids) are a prime example of contagious expansion. A disease follows no rules, nor does it recognize borders as it spreads. A forest fire is another example that fits this category. A 3rd example is social media. Memes and viral videos spread from person to person in contagious expansion diffusion as they are shared. Something that spreads quickly and widely on social media is deemed "going viral.", , HIERARCHICAL DIFFUSION: Follows a chain of command, something you see in business, government, and the military. Fads and trends that start with one community before spreading to the wider public. Hip-hop music springing up in urban centers is one example.Follows a chain of command, something you see in business, government, and the military., , STIMULUS DIFFUSION: A trend catches on but is changed as it is adopted by different groups. An example would be the menus of McDonald's restaurants from around the world. While they resemble the original, many have been adapted to suit local tastes and regional religious food doctrine, ,

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