It looks like YesGraph is solving a serious pain point in what should be a lucrative market. Hiring can be one of the toughest parts of growing a successful company—it's pretty surprising there aren't more products like this out there in widespread use yet.
In a similar vein, I started Mighty Spring (https://www.mightyspring.com). Candidates get a discrete Tinder-like experience for browsing jobs, while companies browse anonymous candidate profiles and request interviews. Anonymity helps passive people use the service without getting spammed by recruiters and protects employed peoples' current work interests.
In private beta, but expediting invites to the HN crowd. Let us know what you think!
Definitely not a place I'd think to go looking for available talent, in any case.
btw HN, AMA