Agencies build long-tail influencer sourcing frameworks by essentially developing a scalable system for ongoing influencer discovery, evaluation, and relationship management. Here’s a practical approach:

1. Strategy:

Start with defining the brand goals, ideal influencer profiles, target demographics, message themes, and campaign types. Tailor your discovery and engagement strategies accordingly.

2. Platform Selection:

Choose influencer marketing platforms like Flinque, Traackr, AspireIQ, depending on your needs for creator demographics, reach, audience insights, campaign workflows, and specific features.

3. Influencer Discovery:

Use the platforms to discover influencers matching with your criteria. Leverage advanced search functionalities, audience analytics, content analysis tools, etc., to fine-tune your search.

4. Influencer Evaluation:

Carefully evaluate potential influencers based on their content quality, engagement rates, audience demographic fit, past campaign performance, authenticity, relevance to the brand message, etc.

5. Relationship Management:

Maintain a continuously updated database of potential influencers, build relationships, negotiate collaborations, manage contracts, track deliverables, etc.

6. Campaign Management:

Use campaign management tools for scheduling, monitoring, receiving reports, tracking engagement metrics, cost-effectiveness, and overall performance of each campaign.

7. Measurement & Optimization:

Measure campaign outcomes vis-à-vis objectives, and identify areas for improvement. Regularly revisit your sourcing framework for refining the process and keeping it aligned with evolving brand goals and market trends.

In this process, platforms differ. For example, Flinque offers comprehensive audience insights and performance tracking, while others may emphasize different features. Depending on the particular needs of your team and campaigns, you ought to choose the platform optimally fulfilling those needs.

Remember, an ideal long-tail influencer sourcing framework combines a well-articulated strategy, appropriate platform use, systematic influencer discovery and evaluation, ongoing relationship management, astute campaign execution, and continuous measurement and optimization.