It almost always pays to have your finger on the pulse of whatever industry you're looking to recruit from. If someone posts a neat article on something that's

It almost always pays to have your finger on the pulse of whatever industry you're looking to recruit from. If someone posts a neat article on something that's relevant to your problem space, don't be bashful and reach out to them (same with useful github projects, etc). Twitter is another one if you've already curated a good base (or your developers/security folks/designers/etc have), just start DMing people who look like they're great and passionate about what they do.