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Yes. A blockchain is one form of a distributed database. A blockchain allows writes from multiple parties without permission. AFAIK, that's the key

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Blockchains are only useful for low-bandwidth tasks that require complete consensus.

"The key" to whom? Most people wouldn't know nor care about a blockchain backed social network - most just want it to work and be without all the current baggage. This being "the key" is only to those forcing blockchain into things where it doesn't belong to justify it's existence.

Well, people who get their content removed probably care about the network being decentralized.

It's not hard to understand the difference between something accruing wealth to the owner or not, being able to be taken down or not, or being able run your own node or not.

People might not care about the technical implementation details. But they do care about what the implication of those details would be.

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