Since the advent of social media platforms, image selection based on social preference is a challenging task that all users inherently undertake before sharing images with the public. In our user study for this problem, human choices of images based on perceived social preference are largely inaccurate (58.7% accuracy). The challenge of this task, also known as image popularity assessment, lies in its subjective nature caused by visual and non-visual factors. Especially in the social media setting, social feedback on a particular image largely differs depending on who uploads it. Therefore social preference model should be able to account for this user-specific image aspect of the task. To address this issue, we present a retrieval-augmented approach that leverages both image features and user-specific statistics for neural image popularity assessment. User-specific statistics are derived by retrieving past images with their statistics from a memory bank. By combining these statistics with image features, our approach achieves 79.5% accuracy, which significantly outperforms human and baseline models on the pairwise ranking of images from the Instagram Influencer Dataset.