Getting a blue comment on TikTok is a way to show that your comment is verified and comes from a trusted source. This can be helpful for increasing the visibility of your comments and making them more likely to be seen by other users.
To get a blue comment on TikTok, you must be a verified user. To become a verified user, you must meet certain criteria, such as having a certain number of followers or being a public figure. Once you are verified, your comments will be automatically blue.