Social media is now in everywhere.
It goes through everywhere except where it cannot.
Many years ago, people from other countries could be a friend by exchanging letters calles "Penpal."
This was a REAL letter that you write on a letter paper and send it with a postage stamp on it. Some people put their country's coins and stamps, or their favorite stickers to let them have more memories about them.
It was very analog style, but it had more stories and memories in it.
People still can make friends from other countries, but in different ways. Not many of them are using Penpal anymore. May be none.
Instead, they have SNS to share their story. They cannot share their own country's coins and stamp, or their favorite stickers anymore, but they can conversate each other faster.
Not many country as now had an internet access, but the population of using internet access increased much more than before. And that is why people can now make friends through online. Faster and easier.