#1 Search engine in Korea

Naver has stayed in No.1 position for few years as a biggest search portal in Korea, and it is owned by NHN Corporation which also owns Me2day, Hangame and Junior Naver. As a research says on the NHN Cop. website, The naver's number of subscribers is 34 million, and number of daily unique visitors is 17 million(July,2009). It is such a huge number in a small country like South Korea.
Now, they are making billions dollar in a year, and I am just wondering that what makes naver so special? What is the fact that attracts people to Naver? Naver initiated Knowledge iN, Naver's Knowledge Search service on Oct. 2002, and I believe that this service have attracted so many users to this website. I believe that this is first knowledge search service on the internet ( Yahoo ask/answer was launched by Yahoo! on December 13, 2005 ). I think it is so unique and useful enough to attract people into this website. Many people are using this Knowledge search service right now, and the number of users will continue to increase as the service becomes improved. As I mentioned in the previous post, portals will change their forms of services, and this knowledge search service will become massive part in search engines, which allows users to communication as they search, ask and answer, in the future. What do you think of this service? Does it look so unique to attract people into this website? It may seems little useless for the other countries' people, but let's think about it. What if Google has the same service of Wikipedia? isn't it going to attract more people into Google?