The overuse and abuse of big-data analysis may destoy human society. Airlines use big data to get your places of interest and commit first degree price discrimination. Health insurance may aquire DNA data from their patients and skyrocket the price only to the vulnerable people of certain diseases. Facebook helped advertisers target teens who feel "worthless", and FB even perform social experiments to "manlipulate" users' mood, they even use face recognition to get the results. Google analyze its users and show "biased" results. Smart appliances "internet of things" track their users and send personalized data to ad companys. Corporate media can tamper people's thoughts via biased news.
In the near future, smart city will be a form of panopticon controlled by tecnology monopoly, where people's activities are watched(and controlled). And there will be no free thought because of overwhelmed analysis(such as face recognitions that analyse mood) and systematic brainwashing. This may even happen at the end of this very century.