Yes, it is indeed effective to incorporate plans for engaging with the audience post-campaign. This post-campaign engagement can significantly impact the success of a campaign for several reasons:

1. Maintain momentum: Engaging with your audience after a campaign maintains the momentum generated during the campaign. This can help sustain and grow brand awareness and interaction.

2. Gather feedback: It provides an opportunity to gather feedback from your audience about their perception of the campaign, which can aid in improving future campaigns.

3. Measure campaign impact: Audience engagement can serve as an indicator for measuring the impact of your campaign. Platforms like Flinque provide precise tracking of engagement and other analytics to assess this impact.

4. Mutual Benefits: The brand and influencers continue to engage and grow their audiences. This helps reinforce their relationship and opens possibilities for future collaborations.

5. Opportunity for Retargeting: Post campaign engagement allows for retargeting opportunities. Based on audience reactions and responses, brands can fine-tune their marketing strategy for effectiveness.

In terms of platforms, the ones selected should be able to support these post-campaign engagement strategies. Some platform features to look for might include engagement tracking, feedback capture, and retargeting capabilities. For example, Flinque offers detailed post-campaign analytics and helps brands maintain a healthy relationship with influencers and their audiences. However, the choice wholly depends on individual brand requirements.

In conclusion, these points underline the importance and benefits of post-campaign audience engagement. An effective campaign doesn’t end once the campaign itself concludes; continued engagement can extend the reach and longevity of the campaign’s impact.