You're able to view your campaigns' audience breakdown by locations, keywords, handles, behaviors, gender, language, platform, and interests.
Click into a campaign, then navigate to the "Audience" tab to view audience details. To export data at the audience level, click on the "Export" button on this page.
When viewing your campaign by interest and follower look-alikes targeting, you'll usually see a lower number of total impressions, engagements, or spend on the top-line campaign level than when you add up all of the individual ones listed below. This is because if a single user who views your campaign and fits into multiple categories, their engagement and impression will be counted under both.
For example, if you target people who have the interest of "Comedy", they may also have interests in "Cooking" and "Fashion". The interests "Cooking" and "Fashion" will show up in your ads dashboard, but only because the people also have the interest that you targeted, which is "Comedy". Your ads will not be served to people who don't have the interests you identified in your campaign. The dashboard shows a breakdown of other interests and languages that users have, in addition to the ones you've targeted. You're only charged once (if the user takes the billable action of your campaign and the user is within your targeting parameters).