A tricky question for you: suppose you asked strangers a question or two (via a survey) and then used their responses to pair them up for one-on-one conversations.
To maximize the average amount paired people enjoy meeting each other, what question or questions would you ask?
Conversation
Replying to
Pair similar:
Stuff to identify politics/religion/class alignment
A basic IQ test question, and openness
Age, gender, are you single/looking (pair opposite who r looking)?
Risk taking vs risk averse?
Humor category?
Moral compunctions?
Attractiveness