New wave of spam heading our way?

Instead of the usual “buy x” scam/spam deal we are recently seeing the emergence of a new form of trash – spam disguised as questions. My question to you is where do we set the bar, how do we distinguish between spam and normal content?

Can we agree to a certain standard of questions, so that we are not drowned in stupid? In mods we trust, true, but there are these borderline cases like the “am I pregnant” question that popped up recently, the stream of pointless “Are you a… person (followed by a list of 10 things that describe it)”. I don’t know about you, but I would hate to see this site succomb to this kind of dreck.’

Any ideas on how to tighten our defences against SPAM?