MASHABLE - Jan 15 - TikTok introduced a new set of privacy rules for users under the age of 18. From now on, all registered users ages 13-15 will have their accounts set to private by default. Furthermore, users in this age group are losing the "Everyone" comment setting, and will now have to choose between "Friends" or "No One" for their comments. The setting "Suggest your account to others" will be switched to Off by default for users 13-15. Duet and Stitch options will now be available only for users age 16 and over, and for users 16-17, the default setting will be set to Friends. And finally, users will only be able to download videos created by users 16 and over, and for users ages 16-17, the default setting on whether they want to allow downloading of their videos will be set to Off.