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//Update:
It turns out that only the 3rd point is correct -- never down-voting.
The 1st point is incorrect due to misunderstanding of some code.
The 2nd point is incorrect due to haven't read the reward splitting code.

By the way, I didn't update OP since it has got some positive votes already. In addition, @dantheman posted another dedicated post to compete with my post and is getting unfair advantage -- instead of posting as a reply to my post, which made it much less benefit for me to update OP. Even if OP got negative voted at last, I'd rather write a new post to correct it.

------- Original post is below -----------

If I understood the code correctly, the first up-vote won't earn more than others. It's all about concentrating powers.

I'm not sure where I read that being first was beneficial, or if I even read it, or if I just inferred that from something I read.

Everyone who votes the post up is a curator. The greater percentage increase in total votes your vote adds, the larger the share of the curator rewards you get. -dantheman

Above is the latest quote I can find concerning curators. I hope dantheman can clear it up for us all. The source to the above quote is here ... https://steemit.com/steem/@dantheman/how-to-interpret-steemits-post-valuations ... but I'm not really following all of it just yet. I'm still trying to wrap my head around what's being said in that post and whether or not being first has any benefit whatsoever.