We measure impressions per recommendation (ad, article, etc) once per page load, when widget is in view.
- Every time a user scrolls down to our widget an event is triggered registering an impression for every recommendation in that widget. The widget is in-view when the hole image in the first row is visible in the browser.
Not an impression
- Widget loads but user has not seen the recommendations
- User scroll back an forth between having widget in view, only counts as one impression per recommendation