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    The latest posted message remains atop the website until it is overwritten by someone else.
    To overwrite the message, a user must pay the previous cost + 10% in ETH via MetaMask
    The new message will remain atop the website and be tweeted out*. The previous message is gone forever.
    All messages go live within 60 seconds of transaction confirmation on the Ethereum network.
    *Twitter changed their API settings and I'm pending approval