If Half of Facebook Accounts Are Fake... What Is Facebook Worth?

Add up the clone accounts and the fake accounts, and one wonders if the total number of fake accounts is more than half of all Facebook accounts. The question that naturally arises is: what's Facebook worth if half or more of its 2.2 billion accounts are fake?
What's Facebook worth when it can't even weed out the most obvious cloned and fake accounts? What's it worth if perhaps it doesn't want to eliminate all those fake accounts?

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