What it isn't...

Facebook Home is not the Facebook Operating System many have speculated about. Unlike Google (GOOG, Fortune 500), Apple (AAPL, Fortune 500), and Microsoft (MSFT, Fortune 500), the company is not pouring resources into creating its own OS. Nor is it "forking" Google's Android OS -- that is, creating its own version of Android as Amazon (AMZN, Fortune 500) has for its Kindle tablets.

- Last updated April 04 2013 05:42 PM ET
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50 greatest business rivalries of all time

These stories of no-holds-barred competition, contempt, and all-out conflict shaped the modern business world.

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