FTX's Sam Bankman-Fried thinking out loud about federated social media, in a Twitter thread. The part about social media starts at #30:
  1. Let’s say that, instead, we put messages on a blockchain.
So if you used Blockchain-Twitter (BT):
--You type the message in BT’s interface --BT posts the message on a public blockchain --Your friend pulls out Blockchain-Facebook (BF) --BF reads your message and displays it
It doesn't need a blockchain. Blockchain's utility is decentralized, global consensus of event ordering.
I don't see why you'd need that for social media. What you need is something more like a relay system, i.e. a large, permissive mempool-like system. That is, not strict consensus, merely high availability and discovery.
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