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I wonder how long will it take for society to ban all social media usage for people under 18 years old.

It will come as soon as governments realize that's a great excuse for requiring an ID to connect to the internet. Think of the children, etc.

It all depends on how soon Congress can act.

Does this include all multiplayer gaming (for example)?

Doing as you suggest is basically what the Chinese government just enacted.

If not, what sets one communication app from another?