Mcm511 Theories of Communication (questions /answers)

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I need answers of following questions

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Mass media are very commonly regarded as effective instruments of power, with the potential
capacity to exert influence in various ways. These propositions give rise to following sub-questions:
1. Who controls the media and in whose interest?
2. Whose version of the world (social reality) is presented?
3. How effective are the media in achieving chosen ends?
4. Do mass media promote more or less equality in society?