This is totally up to the parents if they want to not have kids on social media.

My opinion I have a 7 yr old and I'm totally fine with him not being on social media until he is older
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 Personally, I feel younger kids should be doing kid things like cycling, swimming, skateboarding, raising pets, and generally being close to nature 

To me, it feels unnatural for younger kids to be wrapped up in interpersonal dynamics and cultural memes