How do facebook ads spy tools scrape the data?

How do these websites like BigSpy get the latest ads from Facebook?

Do you need to scrape all the pages on FB to a database and then use Puppeteer or Selenium to click through the Facebook page UI and look at the ads?

Or is it somehow done through Facebook Ad library?

Could someone share the process by which one could code it up themselves?

Thanks.

Example website: https://bigspy.com/adspy/facebook/

You can do with scraping tools puppeteer with searching special items on facebook or instagram.

来源：https://stackoverflow.com/questions/61554253/how-do-facebook-ads-spy-tools-scrape-the-data

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