The document discusses the effects of mass media on individuals, groups, and society. It notes that the impact of media depends on the type of person and medium used. It also qualifies that analyses of media effects should specify whether they concern the past or future, and whether the effect is on an individual, group, institution, or whole culture. Several examples of media effects are given, such as how media can intentionally influence groups, shape individuals' behavior and identity, catalyze institutional change gradually over time, and both integrate and individuate society.