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Re:Peer-to-Peer Based Social Networks: A Comprehensive Survey by EuAndreh on Friday January 10, 2020 @07:01PM (#22016911)
Federated: there's a distinction between clients and servers.

P2P: there are only nodes.

Re:Peer-to-Peer Based Social Networks: A Comprehensive Survey by eeZah7Ux on Saturday January 11, 2020 @10:13AM (#22020234)
No.

P2P: leaf nodes can communicate directly to each other. The network can be flat or structured. There can be more important nodes or not.