When I was working at chumby industries and it was imploding, it occurred to me that somebody could probably write a really good predictor of imminent company failure by scrapping LinkedIn data and watching for sudden surges of activity from people working at the same company.
I'd be surprised if someone (or multiple someones) doesn't already have something like that running, even if just for their own private purposes.
(BTW thanks for Chumby while it lasted. Great product.)
(You're welcome for what bits of chumby I touched. Of course I was just one developer in a team of wonderful developers and hardware designers. It was a great job and a lot of fun. I still haven't decided if we were a bit too late (introduction of iPhone and Android) or too early (explosion in hackable maker devices like Raspberry Pi). I guess a bit of both.
While it's often something of a surprise when you finally do get the axe, you usually have a sense of impending doom, and a feeling that bad things are going down, before it happens. Projects stop getting traction. Upper management stops caring as much about what you're working on. Everyone becomes very apathetic. You get a rash of invites on LinkedIn, and people start updating their resumes.
So, it's rarely a complete surprise, and people often already have some idea of where they're going to go, or are ready to start looking.