Blue comments on TikTok are a feature that links certain comments to search results. These comments are indicated by a blue search icon and are an internal search feature that TikTok is currently testing. When you select a blue search comment, you’ll land on the search results for that term. To make a comment blue, you need to include keywords relevant to the video on which youre commenting. TikTok chooses to turn comments blue based on their algorithm, so there is no button or symbol to add to make your comments blue. While commenting relevant keywords on popular videos boosts your chances of making comments blue, it’s not a perfect method. A comment will be algorithmically turned into a blue search comment only if it’s related to the video.