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I don't know exactly how an "authority" would be implemented in a decentralized ecosystem. However, I do think that better self-policing mechanisms would be a step in the right direction. On that note, you may be interested in the following initiative. The idea is to reward users to flag abuse, overvalued post, etc


https://steemit.com/@steemflagrewards

By authority, I meant a system by which users can collectively help in keeping spammers and such other content in check. This initiative is actually like what I had in mind.

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