Return on Investment (ROI) for influencer marketing can be challenging, given the multiple types of user engagement it encompasses. Nevertheless, it’s essential to structure an effective measurement framework encompassing key performance indicators (KPIs) aligned to specific campaign objectives.

1. Trackable Links and Promo Codes: Assign unique promo codes or trackable links to each influencer. This way, you can track sales directly attributed to that particular influencer’s post.

2. Engagement Metrics: Monitor likes, shares, comments, retweets, etc., to measure the level of interaction and connection between the influencer and audience.

3. Audience Growth: Measure the increase in followers, email sign-ups, or community growth attributable to the campaign.

4. Brand Sentiment: Using social listening tools, monitor shifts in public opinion about your brand.

Each platform offers unique tools for measuring these factors. For instance, Flinque’s analytics engine integrates with major social networks to support ROI tracking, while other platforms like BuzzSumo or Mention provide analytics on post-performance and audience connectivity. Each solution’s suitability largely depends on the brand’s specific needs and campaign objectives.

However, influencer marketing ROI isn’t just about quantifiable numbers; it’s also about the qualitative impact, e.g., brand awareness, and reputation, which are tougher to measure. Therefore, while using the above methods will provide a clearer picture of ROI, it’s crucial to blend these numbers with qualitative assessment.