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This is all very very confusing - I sent 4 Steem to minnowpower up and nothing has happened to my Steem Power or voting power .... does it take several days to activate ?

Did you read everything through? It is said there that you will start to receive upvotes from @minnowpowerup on the next day as all the votes are preplanned at midnight. Your steem power will start to increase through post rewards after you receive those upvotes and seven days have passed.

OK that is great - I must have read to quickly. Thanks.

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