CNN:

 

If there's one thing Mark Zuckerberg has consistently excelled at as Facebook's CEO, it's destroying his enemies.

When Google (GOOGL) launched Google Plus, a rival social network, Zuckerberg put Facebook(FB) in a state of "lockdown" and informed employees that "Carthage must be destroyed," according to one tell-all book from a former employee. 

 

After Snapchat (SNAP) began gaining traction several years ago, Zuckerberg tried to buy the company and, failing that, pushed out a long list of features and new apps to clone the disappearing messaging app.

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