Looks at the use of Twitter as a data source.

Simple, elegant, and powerful, tools are available in user-friendly, free software to help design, build, and run models of social interactions, even on the most basic laptop. Focusing on a well-known model of housing segregation, this Element sets out the fundamentals of what is now known as 'agent based modeling'.

In this Element we develop: stochastic models, which add a crucial element of uncertainty to human interaction; models of human interactions structured by social networks; and 'evolutionary' models in which agents using more effective decision rules are more likely to survive and prosper than others.