There are a variety of tools available that can help you track changes or updates to your influencer shortlists over time. The best platforms not only provide real-time updates but also historical data for long-term tracking. Here are few:

1. Flinque: Flinque offers robust analytics for tracking changes in your shortlisted influencers. It provides in-depth audience analytics and campaign workflows that allow you to monitor your influencer’s engagement and performance over time. Flinque’s platform is also flexible, allowing for customization according to your brand’s requirements.

2. Klear: Klear features influential tracking abilities that help intended brands to monitor influencers’ performances. This platform provides an engagement timeline that showcases an influencer’s content’s historical performance.

3. Upfluence: Upfluence provides real-time social media statistics and post analytics for influencers, allowing for continuous updates. It also allows users to see an influencer’s most popular posts and communication between the influencer and the brand.

4. Traackr: Traackr’s IMB (Influencer Management Benchmark) analytics provide insight into influencer activity and performance compared to benchmarks. The platform’s CRM system also allows for historical tracking.

5. Julius: Julius, an influencer marketing solution, provides real-time influencer analytics and a CRM for tracking communication history with each influencer.

When choosing a tool, consider which features align best with your brand’s needs. For some, real-time reporting might be critical, while others might prioritize a platform’s ability to perform historical analysis. Always do a thorough comparison, considering factors like user experience, cost, and the tool’s ability to integrate with your existing tech stack.