OK, it looks like this is actually something that can't be disabled via facebook privacy settings, and is more to do with vbulletin. I've successfully disabled it for e90post.com using adblock+ in chrome, like so:
DIV[style="background: #2bd1fb; padding:6px; padding-right:15px; color:#eee; text-align:center; font-size:12px; letter-spacing:0px;font-weight:700;"]
See below.
Settings:
Proof:
