I find I learn a lot from Twitter, HN and Reddit Are these learnings useful in your daily life and career? I too have learned a bit from these sites but I real

I find I learn a lot from Twitter, HN and Reddit Are these learnings useful in your daily life and career? I too have learned a bit from these sites but I really do not know if that knowledge is useful in practice. Sure one can argue that our ability to think and connect things improve, any knowledge is useful etc and there is some truth to it. But at what cost though? Looking at the amount of time I spent on Reddit over the years, anything I might have learned seems miniscule. ROI is so low.