I'd love to see a comparison between job ad terms and popularity on stack overflow & co. From the, admittedly little, experience I have with job postings, I've felt that a lot of those that are actually looking to hire (and aren't just using job ads as cheap PR/marketing) tend to be a mix of "it'd be nice if the person knew about X", "let's make this look interesting, so people actually bother to apply" and "hey, I've read an article about Y recently, that's a thing, right? put it in there".