They are both distributed systems, but Usenet is a general purpose distributed message board, it’s a communication system, which is able to support file sharing… There is no central server, but there are servers, so it is a client/server model.
BitTorrent is a peer-to-peer file sharing system, so there are no servers at all… It’s all clients, and it’s specifically designed for file sharing. You could probably layer a communication application over it but there are better systems for P2P messaging…
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