Cost Per Click (CPC) has several variations that are most commonly tracked by marketers. The underlying concept of CPC is measuring the return on ad spend. Tracking the cost of clicks is one way to understand and improve an ad campaign.
Inline Post Engagements include any action taken on an ad, generally on social media. This includes Likes, Shares, Comments, Video Starts and Watches, and Clicks. Each action counts as one Inline Post Engagement, and dividing the cost of the ad by the total number of Inline Post Engagement the ad generated measures the Cost Per Inline Post Engagement. Tracking this metric is a good way to map ad reach, engagement, and return on investment over time.

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