To investigate the relationship among social network site use, online positive feedback, friendship quality and loneliness, a survey research method was adopted in which SNS use Intensity Scale, SNS Positive Feedback Questionnaire, Friendship Quality Scale as well as UCLA Loneliness were administered to 538 middle and high school students. The results indicated: 1) social network site use was positively related to online positive feedback and friendship quality, while social network site use, online positive feedback and friendship quality we...