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https://peakd.com/hive-167922/@themarkymark/introducing-poshbot

I think that is automatic, you only need a twitter account if im not mistaked. But i would ask in the post Marky will explain it better, if he hasn't done it already in his post.

I believe you need share and tag #hive in a Twitter post(share PeakD post to Twitter) and it will pick it up and repost for you