I'd define a system's robustness as the tolerance for systemic shocks. Even a highly robust system, dynamically stable and self-correcting, is just waiting for

I'd define a system's robustness as the tolerance for systemic shocks. Even a highly robust system, dynamically stable and self-correcting, is just waiting for a big shock, which is inevitable. What you really want is a system that benefits from shocks, using the noise to improve itself. Still, a big enough shock and it'll fall apart. The internet ain't going away. Your points aren't specific to Facebook. Between your phone and your credit cards, companies have a pretty good idea of what you do on a daily basis.