Considering an influencer’s previous track record is essential for ensuring the success of your campaign. It provides an indication of how authentic and engaging the influencer is, and thus how effective they might be at promoting your brand. Key factors to consider could include:

1. Reach: Evaluate the size of their follower base. An influencer with a large follower base could help widen your brand’s visibility.

2. Previous partnerships: Review the brands the influencer has previously worked with and their relationship outcomes. Ensure these partnerships align with your brand’s mission and values.

3. Engagement rate: The engagement rate is a key metric. A high engagement rate usually means more successful promotions.

4. Audience demographics: Analyze the influencer’s audience demographics to align with your brand’s target audience.

5. Content quality: High-quality, well-crafted content can increase audience engagement and promote a positive brand image.

Specialized influencer marketing platforms like Flinque can support your evaluation efforts by providing audience analytics, detection of influencer engagement, and unveiling past campaign performance data. Comparatively, other platforms may offer similar features, but the suitability always depends on your team’s specific needs and goals.

Remember, a successful influencer campaign doesn’t just rely on the influencer’s track record, but also on how well they match your brand identity and the objectives of the campaign.