When I was 16 it was easy to vomit every unguarded thought and feeling over t'internet without worrying about anyone outside my circle seeing it. The internet was mostly for us geeks. Sevilians would read the SB, I didn't particularly worry that anyone else would.
But now non-internet people use the internet too*. Slagging off my school? Not something I was particularly worried about. Badmouthing my employer? A totally different kettle of ballgames. I'm sure I'm not the only person who's become a lot more guarded as I've grown - and the internet itself has grown beyond recognition. The media is hyper-aware of it, for one thing. And the wrong thing getting onto social media sites will spread like wildfire.
I do miss the old ways :0(
* Is it just me who feels like people who just use twitter/facebook/amazon etc aren't Internet People? It's like they're meatspace people who use the internet as a tool, as opposed to denizens of the internet. It gives me great joy that one of my friends at work is a humongous geek and very much an Internet Person. You can reference memes and assume she'll have seen the same viral videos, and she'll happily make net-references in the middle of the newsroom. She's Good People.
I suppose it's a bit like the difference between being a fan of Star Trek and being in the Star Trek Fandom.