Influencer marketing can be highly effective when executed correctly, and evaluating Key Performance Indicators (KPIs) is crucial for understanding its impact and success. Here are some important KPIs to consider:

1. Engagement: This includes likes, comments, shares, and other interactions with your content. High engagement signifies that the content resonates with the audience. Many influencer marketing platforms, like Flinque, have detailed analytics tracking these metrics.

2. Reach and Impressions: Reach is the total number of unique people who have seen your content, and impressions are the total views. This indicates the visibility of your content.

3. Follower Growth: This indicates the growth of your brand’s social media following as a result of your influencer campaign.

4. Clicks and Traffic: The number of users visiting your site via the influencer’s platform. Website traffic is a notable sign of potential conversion.

5. Conversion Rates: It refers to the number of actions users take, such as signups, purchase, or download, in response to the influencer’s content. It’s one key ROI indicator.

6. Content Volume: The quantity of content generated by the influencer on your brand’s behalf. It has a direct impact on visibility.

Some platforms like Flinque provide detailed campaign analytics, making it easier to track these KPIs and evaluate campaign performance. But remember, the most important KPIs largely depend on your specific goals and campaign strategy. For instance, if your goal is brand awareness, then reach and impression stats might be of prime importance. On the other hand, if your goal is boosting sales, conversion rates would be more important. Understanding and adjusting these metrics is key to improve campaign performance over time.