For GET v20.0/{object-id}/insights?metric=page_posts_impressions&period=day From this page https://developers.facebook.com/docs/graph-api/reference/v20.0/insights I am trying to get daily, weekly or insights for the last 28 days for page posts, and while having met all the set permissions and facebook app requirements, I always get an empty result set when trying to get the metrics for Page Posts in a specific time period.

If I am trying to get data using the metrics in Page Post Impressions, I get expected results.