Well, my real answer for the first question would be "it depends"
I voted "other" though, because sometimes, the first thing I read on this board is an ongoing discussion here or in Fanfic Related or wherever.
Just talking about fanfic, I usually read the fic first, but there are times where I'm not keeping up with a story, then check a FDK folder just out of curiosity, and the spoilers in there get me interested in the story.
PJ