???
How is restricting access behind an age requirement the same as the "Great Firewall". Right now, as we speak, you cannot use social media until you are 13. They are just increasing that requirement to 16.
There are many many many other things that are already lock behind an age restriction and I don't see you freaking out. Here are a few examples of things locked behind an age restriction:
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alcohol
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gambling
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cigarettes
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pornography
Media has age restrictions. Books have age restrictions, movies have age restrictions, games have age restrictions. Media has had age restrictions for a very long time and it's high time the same standards are applied to social media.