Linked in employees probably can't update their profile without attracting unwanted attention from managers who will hound them about "why are you leaving?!?!" and hence, you know everything you need to.
I'd be suspicious if someone was not updating their profile at least once or twice a year.
Though, in practice, I would just avoid managerial stalking of my employees. So what if someone's keeping their profile up to date? So what if they're checking out the market regularly. We all do it. You'd be a fool not to.
> Why would a manager get agitated about one of his/her people actually updating their skills on their very own site?
Dysfunction is prevalent everywhere in the world. LinkedIn isn't somehow magically exempt because they own the product.