I run only online so that flavors my methods
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I've run all my games the last five or so years on the same discord server. When games have ended some have left it while others have stayed. So I have a base pool of players already vetted once and are (was) available when I run my games.
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Generic group finding communities. The LFG here for example, but also various discords.
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System specific Discord/forums. Here there are folks already invested in the strange system I want to run, only need to find those available.
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VTT specific channels