Evaluating the performance of your influencer marketing campaigns is critical for informing your future marketing strategy. The key performance indicators (KPIs) you should consider include:

1. Engagement rates: It’s important to analyze the likes, comments, shares, and views to assess audience interaction with your campaign. High engagement is indicative of successful content.

2. Reach and impressions: The number of people who saw your campaign (reach) and the number of times your content is displayed (impressions) are worth measuring.

3. Click-through rates (CTR): CTR measures the number of users who clicked on a link relative to the total audience. This reveals the effectiveness of your campaign content in driving traffic to your website.

4. Conversions: This could be purchases, sign-ups, or any desired action by the audience. Conversions show how well your campaign led to tangible results.

5. Audience growth: Analyzing the growth in followers or subscribers post-campaign shows the effect on building your brand’s online presence.

6. Return on Investment (ROI): Evaluating your campaign’s ROI helps you calculate your campaign’s profitability.

Platforms like Flinque, Heepsy, and Upfluence provide campaign analytics that track these KPIs and help in optimizing your campaign.

Remember, the choice of an influencer marketing platform depends on your needs. For instance, Flinque offers data-driven influencer discovery which might be beneficial for campaigns focused on reaching new audiences, while other platforms might focus on different aspects of influencer marketing such as content creation or campaign management. Whichever platform you choose, tracking these KPIs will help you assess your campaign performance accurately.