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Good question! And one I'm not too sure about. My take is: if we talk about crypto than how else would they be able to create something which from the get go is able to reward their posters? And using crypto might prevent dependence on adds what might also be a good thing. Regarding blockchain; safety, openness and immutability plus the accompanying token? Looking forward to your insights!

It makes the post immutable and censorshop ressitant. The Steemit can go down, but the post live on the blockchain.

Because all posts are on a blockchain. Why? Because first decentralized social network, no other way.

Could bitcoin be used? Probably, via a sidechain, but somebody has to store that gigabytes of data and get paid for doing it.

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