Haha, if anything, the internet is even worse at not spoiling plot twists. Most people are cool about not spoiling the plot but you only need one loose butthole to ruin in for you.
Yeah, somebody just did that the other day on here. First freakn' sentence of his post, he tells how a major quest ends, that I haven't finished. Before I knew what I was reading it was too late. It didn't even have anything to do with the thread. It was just like... 'Hey, think I'll just make a random post disclosing a major quest, with zero warning... for no logical reason'.
I never use the guides. Maybe only after I play the crap out of something and then want to find whatever I missed. But that's it. Or if I like a game enough that I just want to have it as a reminder. Which is the case with Fallout.