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To be clear, Facebook doesn't tell any advertisers any information about any users. Advertisers tell Facebook what kinds of people they want to see their advertisement, and Facebook shows the advertisement to those kinds of people.

Supposedly :-) I am always amazed at how poorly personalized facebook are for me or my friends. Basically it's always made of 60% "meeting someone from the area" aka some shaddy semi-porn website. I am really curious of the efficient of advertisement on FB. I know some large brand (GM I think?) pulled off FB because they did not see any ROI.

I wonder if it holds true worldwide and for smaller brands...

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