As an ACE subscriber, you can access Analytics from your dashboard. These reports describe how your friends and followers are interacting with your social media posts. To review this data login to ACE, in menu, click Analytics.
Impressions represents the number of times social media visitors have seen your ACE post, regardless of how many times they have seen it before.
Reach represents the number of unique social media visitors that have seen your ACE post for the first time only. Generally you will have less reach then you would impressions.
Engagement describes how your friends and followers interacted with your ACE posts. This could be a click, a comment, a Like, a share, etc. Generally you will have less engagement then you would impressions or reach.