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in my experience FB's audience network was junk

The first thing I look at when optimizing a Facebook ad campaign is to look at performance by placement.

In many cases, turning off the Audience Network will do wonders for your CPA.

Seconded - one of my default actions when setting up a campaign is to switch that off.

Compared to Google's Display Network using non-retargeting ads? IMO, comparing banner placements to native social is like comparing apples to oranges

GDN is generally bad, worse than FB

I've seen lots of money wasted on blogspam websites within GDN (non-retargeting) -- there's a need to be very hands on if you don't want to waste money across all display tactics, in my opinion

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