I haven't...but I'm okay with spoilers. I sometimes figure out plot lines halfway through movies. A quote from me to a friend the first time I saw The Sixth Sense in the theatre: 'So if the kid can see dead people, is Bruce Willis dead?' The kid said he could see dead people, I took him at his word!
And as you said, the trailers themselves have spoiled more than any postings. I've stayed away from Tumblr because I don't want to see the scenes themselves.