Some Dangers of Technology
Power Consolidation
Obviously, cell phones have not actually caused us all to mutate into zombies. However, they very well could have for all we knew twenty years ago. And if they had that power, most developed nations would be mostly zombies, and all those zombie survival guides wouldn't be funny anymore.
But there are still plenty of things that could go wrong, and plenty of things that have gone wrong, with technology. The internet was supposed to foster democracy in countries with authoritarian governments; occassionally, it has; more often, the government has limited access to the internet so that it has not; yet at the same time, terrorists have organized on the internet and anorexic women in the United States have formed "support" groups on the net.
The basic problem which the unforeseeable difficulties of technology points out is that we tend to move toward new technology more quickly than we tend to move toward understanding of that technology. Facebook was already wildly popular when newspapers started to write articles about it and American society became aware that it was there. Technological development happens quietly; technological adaptation happens loudly, but quickly. And so there is little time to adapt to the challanges that technology raises as we race to adapt to the technologies themselves.