I'm not sure if anyone has noticed this with the proboards app. When you are on the post listing page, it previews the first 80 characters of the post's contents (at least, on my phone). So if you post "True Blood spoilers 5/12" and then your first sentence is, "I can't believe they killed off X (main character)!" app users will see it.
On your pc, I think you only see the preview if you hover the mouse over the post title.
Nothing we can do about it but I just wanted to forewarn those that try to avoid spoilers. If you avoid tv and radio until you see the dvr'd episode, avoid this board too.