Seperate social media by country - that means everyone is chatting within the same ecosystem, and ban it from places where schools are made from cardboard boxes.
My dad, who has completely forgotten how to operate a computer, can't process it when I tell him that places like Reddit are so heavily modded. I told him, yes, there are a range of opinions and facts that are not considered politically correct that are likely to get scrubbed and he went "So what's the point?". Says it all, really. Sometimes Internet illiteracy has its insights.
But before you get too carried away by censorship, remind yourself - it's not China. Yet.