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HF stands for hard fork, which is an update to the blockchain. HF 19 was a few weeks ago and I believe it was designed to level out the votes a little so minnow votes are worth a little more. I'm fairly new as well, so anyone can correct me if there's a better explanation.

In my experience so far, minnow votes aren't worth very much still.

True, but every little bit helps.

Very true. :)