Huge numbers of people in developing and poor regions of the world will get internet access in the next 10 to 20 years, and this will primarily happen through mobile/wireless infrastructure and very cheap personal computing resources. When that happens, the internet will cease to be a relatively exclusive playpen for the developed world.
Culture clashes online are already getting disruptive and will grow massively. Can you imagine social justice advocates on Tumblr trying to have a discussion with someone from a different culture for whom Western feminism is an entirely foreign concept? Or people in well-off parts of the United States talking about freedom of speech and individualism with people who just left their rural village life for a growing Chinese metropolis?
These types of conversations are possible and they need to happen, but even intra-developed world debates on such topics devolve into mudslinging, violent threats, polarization, and what appears to be a form of non-state, net-facilitated ideological warfare. We do not have the cultural tools to handle these discussions. They must be developed and spread.