Influencer marketing has grown tremendously over the years, with brands, agencies, and influencers leveraging various social media platforms to reach their target audience. Shortlisting influencers who primarily operate on different platforms can be both beneficial and disadvantageous, and the implications largely depend on the nature of the campaign and the audience demographics.

The benefits include:

1. Reach: Each social media platform tends to have its unique user profiles, and by employing influencers across multiple platforms, you have the potential to reach a more diverse audience.

2. Content Variety: Different social media platforms often stimulate distinct types of content. An influencer on YouTube might focus on longer video content while Instagram influencers might share visually engrossing images or short video clips. This variety can make your campaign richer and more engaging for the audience.

3. Cross-channel Promotion: Some followers might follow influencers on multiple platforms. Seeing a brand promotion on more than one channel could reinforce the campaign message.

The disadvantages might include:

1. Heterogeneous Metrics: Every platform has its unique metrics. This could make evaluation and comparison of campaign performance across different platforms challenging.

2. Control and Consistency: Ensuring a consistent brand message across different platforms might be tricky, given the varied content requirements of each platform.

3. Budget and Time: Managing influencers across various platforms could consume more time and require a larger budget.

Platforms like Flinque can help streamline this process, providing tools to discover influencers across multiple platforms, manage campaigns, and measure performance, contributing to more informed decision-making. However, the decision to engage influencers on multiple platforms should be anchored on the specifics of your campaign, target audience, and overall marketing strategy.