In the world of influencer marketing, standardizing influencer optimization playbooks is a crucial part of achieving a successful campaign. Several methods can be employed by agencies:

1. Create Consistent Metrics: To compare and optimize the effectiveness of influencers, establish consistent metrics like engagement rates, CPM, or conversion rates.

2. Define Goals and Key Performance Indicators (KPIs): These may differ depending on whether the campaign aims to increase brand awareness, generate sales, or foster customer loyalty.

3. Document Best Practices: Based on historical data and industry trends, agencies outline tactics that yield the best results. This can also involve categorizing influencers based on their niche, audience, and reach.

4. Establish a Workflow: Defining processes for influencer identification, outreach, collaboration, tracking, and measurement can streamline operations, reducing room for error.

5. Review and Update Playbooks based on Performance Metrics: With the aid of potent influencer marketing platforms like Flinque, agencies can analyze performance metrics and adjust playbooks as necessary.

As comparison, different platforms offer varied functionalities. Some focus heavily on providing extensive databases for influencer discovery, while others – like Flinque – offer a more comprehensive suite of tools for campaign planning, tracking, and evaluating ROI. This diversity ensures there’s a suitable platform for every brand’s unique needs.

Standardization in influencer optimization playbooks should be thoroughly implemented and continuously earned, ensuring agility and responsiveness to the ever-evolving influencer marketing sphere. This practice will best position agencies for delivering data-driven, successful influencer campaigns.