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What are these three free downvotes about? doesn't use up RC or Mana?
Sorry i'm a bit dumb, there was no #whitepaper printed so I don't know where HIVE differs from STEEM.

You can do three 100% downvotes in a row, and it takes a day for your Downvote Mana to recharge to 100%. That's what is meant by three free downvotes per day. You can do more downvotes, but it will take longer to recharge.