What is “social media” in this context? I’m barely on any “social” websites other than HN. Getting off Twitter was great. But almost all my friends are on Tele

What is “social media” in this context? I’m barely on any “social” websites other than HN. Getting off Twitter was great. But almost all my friends are on Telegram. They are all over the world and many I’ve known for years. The heat death of the universe is going to happen sooner than me giving up instant messaging. I feel like some of these articles need context or the author has completely different circumstances than I do.