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The structure is completely different. Reddit is organized around topics, not people. When you join r/socialmedia you’re opting into a subject, not a social circle. Facebook groups are tied to your real identity and your existing network, so every post carries social risk, your boss, clients, or contacts might see it. The other thing most founders miss: Facebook groups are creator-centric by design. You build them to grow your startup, which signals to everyone that the space exists to market at them. People feel like an audience, not a community.
