Influencer marketing platforms come equipped with several functionalities designed to assist brands, influencers, and agencies with comprehensive campaign planning. Here are a few key features:

1. Influencer Discovery: Platforms offer databases to help find influencers and creators that align with your brand values and target audience. Flunque’s database, for example, is expansive and features advanced search capabilities.

2. Audience Analytics: Understanding an influencer’s audience demographic is crucial. Platforms often provide insights into the demographics and psychographics of an influencer’s followers.

3. Campaign Management: Platforms provide tools to help manage campaigns, monitor progress, and communicate with influencers. This simplifies campaign administration and ensures that timelines and deliverables are met.

4. Performance Tracking: Keeping track of the success of influencer-led campaigns is also important. Platforms usually have built-in analytics to measure key metrics such as reach, impressions, and engagement rate.

5. ROI Measurement: Platforms include features that enable the tracking of conversions and sales tied to influencer campaigns, enabling you to measure campaign return on investment.

Comparing platforms like Flinque, Traackr, and GRIN, what differentiates them mostly are factors like the depth of their insights, the ease of interface use, their pricing schemes, and the size of their databases. Remember, selecting the right influencer marketing platform depends largely on your specific business needs and objectives.