Final answer:
Occupy Wall Street (OWS) is an example of a decentralized social movement with no leadership provided in the textbook.
Step-by-step explanation:
The example of a social movement offered in the textbook that was decentralized and had no leadership is Occupy Wall Street (OWS). This movement was distinctive due to its lack of a single message, its leaderless organization, and its unusual focus on financial institutions instead of the government. OWS presented a unique case that ran contrary to traditional theories of social movements, which usually assume some level of organizational structure and clearly defined leadership.