How could you conceivably limit a service to only real users? What is a real user anyways? One account per person? What if that person has multiple personas th

How could you conceivably limit a service to only real users? What is a real user anyways? One account per person? What if that person has multiple personas they're curating? Require some form of ID verification? Well now you're talking about thousands of differing implementations. How does one prevent click farms that leverage real fingers tapping on phones? None of these allow a platform to scale like social networks are expected to.