Have a guy on my Twitter Feed that LOVES to blurt **** out about GoT the night it happens.
There may be a couple non-GoT spoilers in my post, but they are both pretty old stuff...
I have a FB friend who does this. Gone from my feed. I also take away the official GoT page as well during the season.
The two worst spoiler experiences for me were the official Walking Dead facebook posting a RIP Lori immediately after the episode, one we didn't get to see until the next day. Grr.
That does not come close to the worst of all though... Back in the day, there was a lot of hype which Harry Potter character was going to die in The Order of the Phoenix. I was being very careful to avoid spoilers as I was reading the book. I was reading something on a wrestling news website and in the middle of a non-related topic, the writer stops mid-sentence and says "It's Sirius Black," then continues on with what he was talking about. I wanted to frigging kill that guy.