Impressions
Impressions count the total number of times a piece of content was displayed on screen, including multiple views by the same person — distinct from reach, which counts unique viewers.
Impressions are the broadest engagement metric: every time the post appears in a feed, search result, or notification, it counts. A single follower who scrolls past the post three times generates three impressions but only one reach. Impressions are the denominator for engagement rate calculations on most platforms.
The metric has limited standalone meaning. High impressions without engagement signals the algorithm pushed the content but the content didn’t convert attention into action; low impressions with high engagement signals the content is strong but distribution is constrained.
Tracked alone, impressions can look impressive while masking weak engagement. Tracked alongside reach, clicks, and engagement, they form a clear picture of distribution versus resonance.