The catch, according to some, is that much of the money
flowing toward the Internet is concentrated on a few dozen of
the most popular sites. That has left smaller, less well-known
sites at a severe disadvantage when it comes to attracting
advertising money and surviving.
In the United States, the top 50 Web sites accounted for
more than 90 percent of the revenue from online ads in the
first half of 2007, according to the Interactive Advertising
Bureau and PricewaterhouseCoopers. The top 10 sites accounted
for 70 percent of the revenue.
