There can be some seeming counter-examples to this rule. For example, isn't the purpose of Facebook to connect people? That sounds like a human problem, and Facebook is very successful. But connecting people is not actually what Facebook does. It provides a medium through which people can communicate, but it doesn't actually create or cause human connection. In fact, most people I know seem to have a sort of uncomfortable feeling of addiction surrounding Facebook – the sense that they are spending more time there than is valuable for them as people.
So I'd say that Facebook is exacerbating certain human problems (like a craving for connection) wherever it focuses on solving those problems. But it's achieving other purposes (removing space and time from broad communication) excellently.
Once again, this isn't an attack on Facebook, which I think is a well-intentioned company; it's an attempt to make an objective analysis of what aspects of its purpose...