Which of the following is an example of a Web 2.0 site?

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Web 2.0 centers on participation and social interaction, with sites built around user-generated content that continuously evolves through user activity. Facebook fits this best because its entire experience is driven by active user involvement: profiles, status updates, photos and videos shared by users, comments, likes, resharing, groups, and real-time feeds. The platform thrives on people creating and sharing content and interacting with one another, making the network itself the core feature.

Wikipedia does rely on user contributions, but its primary purpose is a collaborative knowledge repository rather than ongoing social interaction. YouTube emphasizes user-generated media and community feedback (likes, comments), which is Web 2.0 but centered on video content. LinkedIn is a professional network with user posts, but its focus is career connections. Given these, Facebook most clearly embodies the participatory, socially driven nature of Web 2.0.