Cost per fan refers to the amount of money a company or individual spends on acquiring a new follower or supporter on a social media platform. This metric is often used in marketing and advertising to measure the effectiveness and efficiency of campaigns in terms of gaining new followers. It takes into account the total cost of the campaign, including advertising fees, content creation, and any other expenses, and divides it by the number of new fans gained during the campaign period. A lower cost per fan indicates a more successful and cost-effective campaign, while a higher cost per fan may suggest the need for adjustments or improvements in the marketing strategy.