I use HN comments as a predictor of future events, whether it be product trends or Bitcoin prices. Just take whatever is posted here and reverse it.
Considering the myriad of viewpoints shown on HN, I don't think that is a reasonable take. I first learned about Bitcoin on HN in 2010, long before it became well-known. Also, when Apple announced the Homepod, the financial press was constantly comparing it to Amazon Echo, but HN knew it made more sense to compare it to Sonos. Not every comment on HN is spot-on, to be sure, but the signal-to-noise here is better than 99.9% of the web.
I realised that I can influence this trend by participating more actively in the discussions. Hence, my resolution for 2018 is to more often post questions, rather than arguments to hopefully drive forward our collective creativity and intelligence. HN is a truly special place on the web!