You can assess the effectiveness of your campaign through various methods. One approach is to create a unique branded hashtag, such as #Hersheinboxbffs, to monitor influencer activities. Using different softwares, you can easily track conversations related to specific hashtags or keywords on platforms like Instagram. Additionally, if your main goal is to drive sales, you can provide influencers with affiliate codes or tracking links to measure the revenue generated directly from their efforts. This way, you'll have a clear understanding of the campaign's impact and ROI.