By taking on StudiVZ, Facebook may be trying to start small, building a legal precedent before it takes on Xiaonei or other, bigger copycats.

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He adds that health plans are justified in their efforts to start patients on generic Zocor before they try brands like Lipitor, Crestor or Vytorin.

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The company will announce a start date for that fee sometime this spring, she said, and tickets purchased via third-party sites such as Travelocity or Orbitz before the start date will not be assessed the carry-on fee.

CNN: That'll be $1.99 for your airline soda