Abuse, spam or anything else that doesn’t follow TikTok Community Guidelines can be reported within the app.

Report an account

  1. Go to the profile of the account you want to report
  2. Tap on 
  3. Tap on “Report”
  4. Follow the on-screen instructions

Report a video
1. Tap on  on the video page
2. Tap on “Report”
3. Follow the on-screen instructions

Report a comment
1. Tap and hold the comment you’d like to report
2. Tap “Report”
3. Follow the on-screen instructions

Report a chat
1. Open the conversation you want to report
2. Tap on
3. Tap on “Report”
4. Follow the on-screen instructions

Source: http://support.tiktok.com/knowledge-base/report-inappropriate-content