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What is VEST? And what could the vote value with steem Power I bought if I don't have 1MVEST.

mVEST is your investment in Steemit. I'm not sure what the formula is exactly, but $500 in Steem Power is roughly 1mVEST which makes you a "Dolphin" at which point your upvote is worth more than a few cents.

Right now I have 0.0593M VESTS in Steemit you can find yours at http://www.steemd.com/@revivedvic