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once you have more steem power you will get a vote slider that will let you adjust your voting weight for each post. So you could vote every post at 50% and you will have twice as many votes to give out but half of the rewards that you would receive if you voted at 100%. Since you don't have a lot of steem power yet each of your votes are already at 100%. To power up a post means to get paid out in 100% steem power instead of 50% steem power and 50% steem dollars. You have the option when you author a post.

Wow, thanks for the valuable info.

you're welcome. Steemit can be a little confusing at first don't be afraid to ask questions.

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