I've had pretty good success with Twitter. I am careful to limit my followers to avoid cluttering up my feed with stuff I don't want to see.

I mostly follow the math teacher/early education crowd and regularly get inspired with fun math games and other activities to do with my kids. Plus I've gotten a lot of neat books from the library after seeing someone mention them on Twitter.

So for me it's been a good signal-to-noise ratio, unlike e.g. Reddit where I can definitely relate to that elusive value-chasing you describe. Even on HN, the amount of relevant stuff I learn is low compared to the sheer amount of time I've spent here over the years.