The internet is not a "fad" (love that word, btw. very nostalgic). Never said it was. Besides, nostalgia is just mental *********ion. Live in the present.
Social media is a staple of the internet. Today it is. Tomorrow, who knows...
As long as there is something called instant gratification there will always be someone posting their lives on social media looking to seek it. There won't always be something called the internet.
If u don't like that then stay off social media. You're getting mighty defensive with age. Not a good sign. Ask yourself, what comes after greedy?