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by dkokelley 3615 days ago
Facebook uses their pixel [1] to determine what their visitors do on their advertisers' sites. The pixel can be set with various options, such as a "purchase" pixel with a revenue component. When you initiate campaigns in Facebook you have the option to define a goal of conversions (views of a specific Facebook pixel), and Facebook will report back the conversions from your campaign.

1: https://www.facebook.com/business/help/952192354843755