Check out this 2017 episode of Planet Money about how Feeding America solved a local knowledge problem with its own internal market. This may be interesting to leftists as well, as they needed special market rules to make sure the needs of the poor were met. There's a socialist in this story.
Liberdon is a Mastodon instance for libertarians, ancaps, anarchists, voluntaryists, agorists, etc to sound off without fear of reprisal from jack or zuck. It was created in the wake of the Great Twitter Cullings of 2018, when a number of prominent libertarian accounts were suspended or banned.