Reddit and Hacker News are hard really on dupe content, which is a different case because link submissions are exactly the same, but either way, the general ethos is to be a huge asshole about it. And Stack Overflow's take on things makes a lot of sense sometimes when you're a power user who knows when things show up all the time. As you alluded to, calling some of these places communities might be a stretch, but it's still a very important place for discussion in our field.
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Reddit and Hacker News are hard really on dupe content, which is a different case because link submissions are exactly the same, but either way, the general ethos is to be a huge asshole about it. And Stack Overflow's take on things makes a lot of sense sometimes when you're a power user who knows when things show up all the time. As you alluded to, calling some of these places communities might be a stretch, but it's still a very important place for discussion in our field.