I will be honest, this is simply ingenious in its brilliance and its evilness.
If you are any kind of government a system like this would be the best thing in the world. It would allow you to monitor your people and be able to identify possible troublemakers, but more than that it will allow the people to sort out the dissidents for you. Because of how people's brains work, society in general will act as a kind of social police force, with people reporting on each other and shunning those who are dissidents.
Not to mention that the power available for personal abuse is staggering. If the government does not like someone all it takes is a little tweak of a score and the system will take care of itself. Having access to a system like this you could topple political or corporate rivals almost instantly.
It truly is an ingeniously insidious system. It honestly wouldn't surprise me if something similar started appearing in all developed countries. With the cancer like spread of smart phones and social media and people being connected at all times and sharing their private data constantly, I could see a system like this being easily instituted and with the right marketing would even be welcomed by the population in general.