Racial networks can be represented, in network theory, by groups that have links to each other, and fewer individual links to other racial networks. These groups help sustain triadic closure between other racial networks, which creates a great amount of stability with the whole worldwide racial network. Several articles I have read talk about how racial networks can spread positive or negative cascading effects within a population.

http://rss.sagepub.com/cgi/content/refs/17/2/191

This link talks about how a population of Bayesians are given observations and concepts from outside sources, and the people are forced to choose what to believe in: Their private preferences or the preferences of others. This experiment tests how potentiatlly negative and unpopular norms emerge within a population of heterogeneous beliefs and preferences.

http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=251645

          In another abstract, the article mentions health-related cascading within an African population. The information that spreads around the medical arena makes a huge impact on the health effects of Black behavior. As a result, they decide to implement a democratic structure so that unpopular information can be spread more quickly and easily, as long as it will provide positive effects on the health of African Americans.  

        These two cascades of distinct racial groups show how influential information can affect the health or behavioral conditions of the whole population. The so-called tipping point is the point when people convert their beliefs to an uncommon belief, and these situations should be examined closely so that a population’s health will not be undermined in the future.