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If you are using Facebook on a recent phone client, or through a browser, whenever this happens, try this:

- There is a little "chevron" menu popdown in the advert, generally top-right.

- Tap it, and then pull down "Why am I seeing this?"

Then you will find out why you are seeing the advert.

Source: I used to work at Facebook

"One reason you're seeing this ad is that bluefrog Plumbing + Drain wants to reach people who are part of an audience we created based on data provided by Acxiom. Facebook works with data providers to help businesses find the right audiences for their ads."

So, it's Acxiom doing the listening?

Axciom does all of the data buying and creating models to figure out what people like.

Source - Used to work with Axciom data myself

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