CPE - Cost Per Engagement
When an advertisers buys an ad on a CPE (Cost Per Engagement) basis, they are charged each time someone engages with their content. An engagement could be a like, comment, reaction, link click, poll vote, or share. Each platform defines engagements differently and there is a difference between public engagements (like, comments), and private engagements (link clicks, detail expands, hashtag clicks, etc.).