The above image is from the reddit discussion "After seeing a recent post about the population of Indonesia, this occurred to me" and is a powerful illustration of where the next billion people coming online will reside.
With much of the western world already online, over 80% according to the The World Bank, the next billion will come from other geographies centered on people dense areas in South East Asia due to scale and cost of connectivity.
Three Recommended Links
Map: More than half of humanity lives within this circle - A break numbers down of the countries with in the circle by Caitlin Dewey at the Washington Post.
Closing Keynote Interview with Clay Shirky - FORA.tv - A very insightful talk at Quartz - The Next Billion Forum by New York University Professor Clay Shirky who shares his thoughts on several aspects of changes with these next billion users.
Dave McClure: The Gospel of a Lean VC [Entire Talk] - YouTube - Venture Capitalist Dave McClure at 500 Startups talks about the new opportunity with the next billion online users with in different language groupings at Stanford University Entrepreneurship Corner.
Image by reddit user valeriepieris