The true rival to X is not using social media at all. If you’re mad at your Skinner box, switching bubbles won’t improve your life.
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Saying that HN is social media is like saying that a taco is a sandwich.
I think there are two central criteria for some interaction-based online system to be called 'social media': follows, and DMs.
Hacker News has neither of these things, so it isn't social media. YMMV.