The data shown for “Actions” include all actions taken by users within 24 hours after viewing an ad or sponsored story in your campaign or within 28 days after clicking on it. You will only see this data if you are promoting a page, event, or app. Actions include page and post likes, event RSVPs, and app installs. For example, two page likes and two comments would be counted as four actions.
/ CM Tooltip Glossary Pro / Actions