Major Internet Hubs See Lesser Influence

"As people increasingly turn to blogs, social-networking sites and other sources of user-generated media, Google Inc., Yahoo Inc., Microsoft Corp. and Time Warner Inc.'s AOL have spent more than $10 billion collectively this year to acquire companies and technologies that help extend their online advertising networks."

http://money.aol.com/news/articles/_a/major-internet-hubs-see-lesser-influence/n20071007134909990023