International research suggests one in 10 hospital admissions can result in some kind of adverse event, whether that is a patient fall or an unexpected death, so learning from these mistakes can save lives.
So, I think the conditions are right for anevent to result in a social network ban and given the size of Facebook they will likely be the first target which could certainly dampen their coming IPO which is currently expected to set records, well above what the company is currently worth.
Depending on the point of view, zombies may result from an act of God, the irresponsible use of science, an environmental disaster, a cosmic event and so forth.