The new buddy comedy 50/50 starring Joseph Gordon-Levitt and Seth Rogen has launched a Facebook engagement called Who’s Your Go-To Buddy After an introduction by Joseph, Seth and the screenwriter the application begins pulling the user’s Facebook data and lets the user choose at least 5 friends to decide who their go-to buddy is. After analyzing the friendships, the app chooses the least annoying friend and someone that has the most in common with the user (polling from FB data like birthdays, locations, groups, hometowns). If the user is unsatisfied with the results, they can pick their own friend and identify their go-to buddy. Results can be posted to the user’s wall. Fans can also “Like” the official page and enter to win a hometown screening for 50 friends!