The Giant does occasionally read the Forums. Not deeply or regularly, perhaps, but he does, and occasionally replies to people and such. (Just open the spoiler box in my signature and click on the links, it will lead you back to a thread in January where he responded to a fan protesting that the way the Black Dragon was able to use the anti-magic field to almost kill V violated the rules and description of the spell. And even though it's mostly been erased now, the dumb schmuck then angrily flamed The Giant, both in the original post and in the Giant's response that he didn't care about D&D rules).
Hence, it's become common practice to either say spoilers in the thread title when talking about speculation, or to spoiler them in the thread itself.