The number of unique people who took an action such as liking your Page or installing your app as a result of your ad. For example, if the same person likes and comments on a post, they will be counted as 1 unique person.
The number of unique people who took an action such as liking your Page or installing your app as a result of your ad. For example, if the same person likes and comments on a post, they will be counted as 1 unique person.