simple. just avoid the thread called "cheats hints and spoilers" and you will not see spoilers
Sadly, no :/ If the Fallout forums are anything to go by, people not only post spoilers in the general area, but spoilers in their titles. So even if the thread gets moved, the title sticks around on the page until its knocked down by other posts.
Personally, I'll probably start avoiding the forums come November, and maybe start lurking again around December.