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The Four Best Reddit Alternatives
(lifehacker.com)
This is a most excellent place for technology news and articles.
For specialized communities or works pretty well.
Except communities on Discord aren't search-engine-facing, so they're a complete dead end. Nobody can discover useful information there unless they are already members of that particular community. It's the "walled garden" effect.
As an example, the very specialized /r/IPv6 community seems to have adapted fairly well to Discord.