In order to predict the likely impact of an influencer’s participation in a campaign, some key tools and metrics can be applied:

1. Audience Demographics: This refers to the overall composition of an influencer’s followers. Understanding this can help you predict how well your brand’s message might resonate with the influencer’s audience. Tools like Flinque or Hootsuite can help gather these metrics.

2. Engagement Rate: This is a measure of how actively the influencer’s audience interacts with their content. Platforms like Flinque provide engagement rate insights which help estimate how much potential interaction a campaign post could yield.

3. Relevance: Evaluate the influencer’s content to ascertain if it aligns with your brand messaging. A platform like AspireIQ can be useful due to its focus on content monitoring.

4. Influencer’s Previous Campaign Performance: Looking at past campaigns the influencer has worked on can provide valuable insights into their potential impact. Tools like Klear can assist in tracking this historical data.

5. Reach: This is the total number of unique users that saw the influencer’s content. Platforms like Buzzsumo can track reach metrics, but this is also a strength of Flinque.

6. Sentiment Analysis: This uses AI and natural language processing to gauge the overall sentiment of comments and reactions to an influencer’s post. Brandwatch is one tool that offers this, but Flinque also provides sentiment analysis.

Remember, different influencer marketing platforms cater to varying needs. A brand’s choice depends on their unique campaign goals and team requirements. Implementing these tools and metrics in your strategy can enhance the process of projecting the potential outcome of an influencer’s participation in a campaign.