For my sins, I am on LinkedIn so an e-mail pinged into my inbox the other day trumpeting their new initiative. The theory is that they have lots of bright young things saying I went to University X and couldn't find a job / got employment with firm Y. They then follow up with I had a job at Y and couldn't stand it so I left for company Z / I loved it so much I stayed for years. And so on.
They have compiled this cyber stalking information into League Tables. Early days, not very comprehensive (only lists five careers) and unsurprising results but what do you think?