The 'In Common' section tells you things you and a potential roommate share. This can include:
Same answer for the smoking question
Same answer for the pet question
One or more academic majors in common
One or more housing options in common
One or more shared Facebook interests
To change the answers to the first 4 bullet points above, go to the More tab on your app and tap My Profile. When you update your answers in your profile to smoking, pet, majors and housing, this will reflect in what shows as In Common on RoomSync with other users. To update Facebook interests, visit your Facebook profile on your Facebook app or at www.facebook.com.