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Impressions is a metric that counts how many times an ad or promoted posts is fetched from the server and displayed on a social network. It is not a measure of how many people have seen the ad. For example, one social media user might have the same ad appear in their newsfeed multiple times over a certain period. Each of these instances is counted as one impression.

Learn more: Reach vs. Impressions: What’s the Difference (And What Should You Track)?