Final answer:
True. Social movements express the opinions of the weak and oppressed, providing alternative means of political expression and influence. They arise in response to incidents, publicize the truth, and demand action.
Step-by-step explanation:
Social movements often express the opinions of the weak and oppressed. They provide an alternative means of political expression and potential influence when the formal mechanisms of democracy fail to represent their views. These movements may arise in response to specific incidents and aim to publicize the truth and demand action. They can range from protests against specific conditions to campaigns for specific reforms and even revolutions.