This is the seventh chart area down your report page by default. The metrics associated with this chart and their formulas are as follows:
Twitter Engagement Rate: The number of engagements (clicks, retweets, replies, follows and likes) divided by the total number of impressions.
Twitter Engagement: Total number of times and user has interacted with a Tweet. Please note that this total includes all clicks anywhere on a tweet (including hashtags, links, avatars, usernames and tweet expansions), retweets, replies, follows and likes.
Twitter Impressions: Number of times users saw the tweet on Twitter.
Twitter Clicks: Number of clicks including hashtags, links, avatar, username and tweet expansions.