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RE: We should be posting more qualitative content on SteemIt
When a big user (whale) up votes you he is giving you some of his power. After a while your account will be much more powerful than a normal account, it's what we call a dolphin. Your voting power goes up. Dolphin is just the name that we use for accounts that received a lot of power from whales.
Thanks for the explanation @najoh. I can now confidently say that I know the difference between a whale and a dolphin.