This study aimed to systematically review the use of social networking sites (SNSs) from an older adult perspective (all papers had an average sample age of 65+ and samples ranged in age from 50 to 98). Characteristics of older adult SNS users, incentives and disincentives for use, and the relationship between SNS use, wellbeing and cognitive function were explored. From a systematic search, 21 papers met inclusion criteria and were subjected to a quality review. Paper quality was often low or medium, as rated by a standard quality assessment framework. Results indicated that older adult SNS users were more likely to have particular characteristics, including being female and younger. The main incentive for use was to maintain contact with family and friends. Disincentives included privacy concerns and lack of perceived usefulness. The relationship between SNS use, wellbeing and cognitive function was inconclusive. SNS use is a multi-dimensional phenomenon that needs to be understood in the context of broader communication practices, individuals’ social relationships, and individual preferences and characteristics.