There are several key factors to consider when choosing influencers for your campaign:

1. Audience: It’s essential to select influencers whose audience matches your target demographics closely. You can utilize audience analytics features on influencer marketing platforms like Flinque to gain a comprehensive insight into the influencer’s audience.

2. Engagement Rate: An influencer’s engagement rate is a strong indicator of their audience’s interest and interaction level. A high engagement rate is usually a good sign as it shows the influencer’s content resonates well with their audience.

3. Content Relevance: The influencer’s content should align cohesively with your brand image and campaign message. Their style, tone, and content topic should naturally introduce your campaign, making the promotion part feel more authentic and engaging.

4. Consistency: Review their past posts to gauge consistency in content creation and engagement. You’d want an influencer who is reliable and maintains a constant online presence.

5. Track Record: Check out the influencer’s past collaborations to understand how successful and authentic they were. Some platforms, including Flinque, provide past performance analytics which could be valuable in assessing this.

6. Affinity with the brand: Collaboration with influencers who genuinely use and like your product results in more authentic endorsement.

7. Budget: Finally, always consider your campaign budget while choosing influencers. Some influencers might have high engagement rates and reach but might also charge more.

While platforms like Flinque, Traacker, and AspireIQ offer different tools for influencer discovery and analytics, the choice depends on your specific needs. These platforms have robust features to help you identify influencers, plan campaigns, and measure the ROI effectively. Be sure to explore and choose the one that aligns most closely with your objectives and budget.