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What do they do with the @null money . I think they just destroy it or maybe use it for something els?

null is the account where all the "promote" money goes. As far as I know.

that's why some account transfered to null. the question is, how much promote i will get for 1 SBD? :D
thankyou for your attention

when you want to promote a post, first look at the category in which you want to post and look the promoted section. i.e. photography, promoted. look at the boost payments listed on the posts, if a post has a boost of $1.00 then if you promote your post to $1.01 your post will be above the $1.00 1

I see. I have plan to promote my post when i have balance enough. Thanks for sharing

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