We count an impression each time a visitor sees one of your pages. However, for popups, we won’t count an impression unless your campaign is actually triggered.
For example, if you have a popup set to show up after 15 seconds and the visitor stays on your page for just for 10 seconds, then the popup will not be shown to this visitor and no impression will be counted.
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or associated with, Facebook. Facebook is a trademark of FaceBook INC.