I interesting turn of events. I've always shared other people's post via twitter before now. Seems better for the community in the long run.
Also, I think diversity should be encouraged. Users should not posh the same author over and over again. Just a random thought.
That's true, for that we already have restrictions in place of how often the same author can be curated by us, this engulfs all our curation activities with very few exceptions. In the beginning we may reward good tweets from the same users more often with a comment upvote, though, to encourage more great POSHing.