I'm only a couple of years older than you are. Some of my friends had internet at home well before me during high school, but I only got it when I moved after High School (my parents weren't so much anti-tech are completely outside of it).

So while I very well remember goatse, tubgirl and rotten.com, I only discovered those as an adult.

Also note that I wasn't singling out social media here. It's the web as a whole that seems very unsuited for a teenager without supervision, IMO.