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YouTube
For younger kids, YouTube Kids: a separate app with filtered content, age-based profiles and the option to approve channels manually. From 9–12, regular YouTube can be used with the supervised experience of a Family Link account, which applies three levels of content filtering and disables comments.
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Netflix and other streamers
Create a kids profile with a set age rating and — the step most people skip — protect adult profiles with a PIN. Without the PIN, the kids profile is just a suggestion. Disney+, Prime Video and Max have equivalent features.
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Roblox
In parent settings you can link your account to your child's, choose who they can chat with, restrict experiences by age, limit time and disable chat entirely for younger kids. Review often — the platform updates these options a lot.
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Discord
Minimum age is 13. The Family Center lets you see, with the teen's consent, which servers they joined and who they interacted with — without reading message content. Finish the job in their privacy settings: direct-message filtering on, messages from strangers blocked and friend requests restricted.
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Instagram
Teen accounts default to private, with restrictions on messages from strangers and limits on sensitive content; supervision lets parents follow usage time and the following list. Still, the minimum age of 13 exists for good reasons.
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TikTok
Family Pairing links your account to your teen's to set screen time, restrict content, control who can message them and turn off search.
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WhatsApp
Honest answer: there's no native parental control. What you can do is tighten privacy settings (photo, last seen and group adds limited to contacts) and, above all, agree on family rules about groups with strangers. For younger kids, many families delay WhatsApp and use supervised alternatives such as Messenger Kids.