I agree on HN, though I think it's markedly different as it moves slow enough that you can just check it once or twice a day and get most everything you want. Whereas a lot of other social media is an unlimited feed of everything, ephemerally, and can make you feel like that if you blink, you'll have missed something.

I do check HN from my phone, typically in the mornings and night when I have downtime and don't want to watch TV or read a book. But I can't say I've ever been at a park, bar, or airport lounge and just itching to see what was going on HN this second.