When planning a campaign using influencers across multiple platforms, key considerations include:

1. Influencer Selection: Assess each influencer’s reach, engagement, relevance, and audience demographics to ensure they align with your brand and campaign goals. Tools like Flinque can help you in this process, providing detailed analytics and comparisons of influencers across different platforms.

2. Platform Compatibility: Not all influencers perform equally well on all platforms. Match influencers to the platforms where they have the most influence, based on platform-specific analytics.

3. Content Approach: Different platforms require different content strategies. Ensure the influencer’s content style suits the expectations and norms of each platform.

4. Measurement and Tracking: You need a method to track the performance of your campaign across multiple platforms. Track metrics relevant to your campaign goals, such as engagement, reach, conversions, etc.

5. Legal and Regulatory Compliance: Ensure that all influencer content adheres to each platform’s rules, as well as FTC guidelines on sponsored content.

6. Budget: Costs may vary based on platform and influencer. Consider allocating budget dynamically based on performance.

In comparison to similar platforms, Flinque offers features for influencer discovery, campaign management, cross-platform compatibility, performance tracking, and ROI measurement. These features can assist in handling many of the above considerations. But remember, the suitability of a tool like Flinque or any other influencer marketing platform depends on your team needs.