In less than 20 years, the internet has spread, quickly and across borders, all around the globe.  GlobalPost, using data on internet access from The World Bank, has created a map showing the adoption of the Internet over the last 20 years.  It highlights the rapid growth of the internet, but it also highlights another facet of the growth of internet access: the inequality of just where that access is available. For example, by 2012, internet usage in North America had spread to over 80% of the population, in that same year in South Asia, only 12% of the population had access and in Sub-Saharan Africa, only 15%.

You can see the map and read more about it here.