Google's next big thing?

It's spent billions to buy companies in advertising, communications, and software. Which one of them will drive Google toward its next $20 billion?

President of global sales operations, Nikesh Arora, says that healthy competition from Twitter and Facebook is a good thing. More
After recent criticisms of the iPhone, it appears the Facebook founder has taken a real shine to Google. More
The iPhone 4 launch doesn't appear to have slowed the growth of Google's AndroidOS. More
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