Comment by Balinares

They (correctly IMO) seem to think that the hard thing in sourcing the top candidates by the sort of metric they care about, is getting them to even know about you as a potential employer. That means figuring out where those candidates might be and finding ways to get your name in front of their eyeballs.

So, cool nerdy blog posts on HN, cool nerdy puzzles on Cracking the Cryptic, etc.

Having been sorta involved in hiring in the same sorta market, I can respect how astute their approach is.