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If you advertise on facebook you don't care too much about reported numbers. It's add spend in, conversions out.

The facebook targeting back 2 years ago at least, amazing. There is a niche for hyperspecific advertising and facebook just crushed it (I'm not posting on facebook / no facebook app, so I think they suck for human health).

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The parent is correct.

What a lot of HNers don't understand is that:

1) if you're a digital marketer with a budget, you have to spend the budget. Even if you know the metrics don't add up, you just keep spending until somebody finds a platform with a better ROI.

2) ad platforms don't like to talk about their secret sauce, because that would attract scrutiny.

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