Influencer marketing has become a critical strategy for brands, with micro-influencers playing a pivotal role in shaping consumer behavior on social media. These influencers significantly impact user decision-making; however, identifying the right micro-influencers who align with a brand’s identity and can maximize engagement remains a challenging task. This study aims to develop an effective system to predict which micro-influencers will generate the highest engagement for brands. The proposed method combines ResNet for extracting visual features from Instagram posts and BERT for extracting textual features, demonstrating a high degree of accuracy in predicting engagement rates. Three machine learning algorithms—Linear Regression, Random Forest, and Extreme Gradient Boosting—were employed for model training, with performance evaluated using Root Mean Squared Error (RMSE). Among these, the Random Forest model, enhanced through feature selection and hyperparameter tuning, achieved the lowest error with an RMSE of 1.50 %. Further evaluation using metrics such as AUC, cAUC, and MedR demonstrated that the proposed approach (ResNet + BERT) outperforms other methods across all metrics, achieving an AUC of 81 %, a cAUC of 67 %, and a MedR of 2. The proposed method improved AUC by 12 % and cAUC by 8 %, confirming its effectiveness in identifying high-engagement micro-influencers.
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