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Once joined, the page will automatically welcome them so the person who make the invitation can take a screenshot of the welcome greeting from each one an then place a comment on the original post (https://steemit.com/projectmilkbox/@milkbox.info/handshake-project-milkbox-challenge-bring-your-friends-to-discord-or-share-the-voice-for-milks-tokens) of the contest with the screenshots and tag the two friends