The Seymour Duncan forum has the ignore function, and before this board had it, I tried it out there on a bunch of people I could live without. I found that it didn't really work for me, because in the flow of a thread I always wanted to see what they had written anyway (even if it was offensive or just stupid). I might like it better if all trace of the person that was being ignored would disappear, but since they're just hidden behind one click, I don't find it all that effective. So I'm not ignoring anyone.
I have one person ignoring me. Since I consider him to be a troll, I have no problem with it.