There was a recent study by Arthur Aron and some other people that explores whether intimacy between two strangers can be accelerated by having them ask each other a specific series of personal questions. The idea is that mutual vulnerability fosters closeness. You can read the study here http://goo.gl/QxfV33
These 36 questions are broken up into three sets, with each set intended to be more probing than the previous one. The idea is that mutual vulnerability fosters closeness. As the study authors says: “One key pattern associated with the development of a close relationship among peers is sustained, escalating, reciprocal, personal self-disclosure.” Allowing oneself to be vulnerable with another person can be exceedingly difficult, so this exercise forces the issue.