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Postmill is a free, web-based, social link aggregator with voting and threaded comments.

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    Without screenshots or a demo instance, it’s hard to be very interested, especially as someone with little PHP experience or interest.

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      especially as someone with little PHP experience or interest.

      Yup, I was posting this more in spite of being in PHP than because of it. I’m interested in these Lobster-like sites (because I’m working on one myself), and the main deployment of Postmill appears to be Raddle, so check that one for a demo.

      And like Lobsters was created in objection to some HN policies, Raddle was created because of objections with the way Reddit is run.