Research into online social network site (SNS) addiction (i.e., excessive and compulsive online social networking) has expanded over the last years. This paper aims to give a review of this research. Although not formally recognized as a diagnosis, SNS hii addiction shares many similarities with those of other addictions, including tolerance, withdrawal, conflict, salience, relapse, and mood modification. Several screening instruments to identify SNS addicts have been developed—approaching th...