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No. You can upvote your post using minnowbooster even if you're not yet whitelisted. However, you'll be limited to spending 50 SBD only.

According my research i read that minnowboster upvotes you 3X the amount you sent.
For example i write a post and then send 5SBD, and minnow booster is at full strength of 60%. what will be their upvote worth on the post?