Ok....so I had to think how to answer this
I am one who posts a lot and who reads every post. I don't always agree. I've been called "negative". I just happen to not agree. I don't believe because I don't agree with a post that this makes me negative. I believe it makes me someone who just doesn't agree. It also makes me someone willing to speak up even if what I'm saying does disagree.
Answering posts....that's a toughie. I do read most every post on the boards I frequent. I don't feel it's up to me to answer them, just because I've read them. Sometimes I have no answer, or no opinion.
My suggestion is to find boards where the owners are active and the owners participate.