For collecting quality sources of third-party information would be my guess? I could be wrong, but this is a huge part of the HN user psychology and admittedly a favorite aspect to observe. You can even see arguments about it between first- and third-party-preferent users ("learn to use your own brain--think about it first" vs. "why reinvent the wheel--do your googling/research first").
Totally. I outsource a lot of my reading choice to others. Would love to follow someone with a similar reading taste. There must be a product for that.