click here to go directly to the full, interactive infographic) South Korea ranks fifth on the graphic, which is remarkable given the much larger population of three of the other four countries ahead of it. The three largest internet companies in Korea, in rank order, are Naver, Nexon and NCSoft. Naver, of course, is a Korean language "search" portal, while the other two companies specialize in online games.
The data for The Economist infographic and article came from the World Startup Report, a not for profit organization. Another graphic published by that organization helps to put the size of Korea's internet companies in global context. (click on graphic to see a full size version) As noted by The Economist, Google is larger than the peak value of the companies in all other 48 countries combined.