The map above is an infographic of the largest online web properties.
Notable websites are Google, Facebook, Yahoo, Craigslist, Wikipedia, Youtube and others.
What is most impressive is the way that these sites got so large. None of them had any large scale advertising program, and most did no advertising at all. These sites all grew to become industry leaders through viral marketing and word of mouth.
How can you replicate this success? Build an online business that people have to use.