The best comparison I think that I might have ever come up with is this one:
The way that Facebook has grown and is scaring a lot of the biggest tech websites out there including Google much like how the United States is scared about China becoming the second largest economy in the world.
We are often wondering is there a China bubble that is just waiting to pop. "Is facebook a bubble waiting to deflate like yahoo and such?" Is often asked.
Facebook users take up 9% of all web traffic and time spent on the internet where China is purchasing billions of dollars of our debt and now own over 9% of all U.S. treasuries.
Google serves up ads so does facebook. Face-book is taking ad share. China is taking Americas share of natural resources and driving commodity prices higher as Facebook and Google drive ad bidding wars.