Monetizing personal data

We all know that social networks and other companies have a business model based on people's personal data: they ask you your name, location, age, sex gender, things you do and things you like, etc. etc.

I wonder... how do they monetize this information?
Who buys that info and why?

I can imagine that Facebook also uses that data for selling targeted advertising within facebook, but i know it is not the main way they are monetizing it.
They sell it too, but i am curios to know who buys that...

Monetizing personal data

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