Well, there definitely are malicious spoiler trolls to - I've encountered them, in this fandom and, more recently, in Heroes fandom. (Well, actually, in some of those cases I couldn't tell if the posters were just clueless or trolls. The forum for Heroes that I go to doesn't exactly have a large population of members who understand netiquette or posess great maturity.)

I probably will find a way to filter my comms, because I do belong to some that have spoilery potential. And definitely no site visiting. Because when I was thinking about that, I realized two sites and a few groups I belong to are extremely ship-specific. So if a character of one of the site's Chosen Ship dies? Yep. (Or if that ship stops being canon for other reasons, but that better not happen!)