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From the spreading of diseases and memes to the development of opinions and social influence, dynamical processes are influenced heavily by the networks on which they occur. In this talk, I'll discuss social influence and opinion models on networks. I'll present a few types of models --- including threshold models of social contagions, voter models that coevolve with network structure, and bounded-confidence models with continuous opinions --- and illustrate how such processes are affected by the networks on which they occur. I'll also connect these models to opinion polarization and the development of echo chambers in online social networks.