Well-being has rarely been used to discuss the post-adoption behavior of information technology users. Currently, satisfaction is the primary predictor of user behavior in IT post-adoption research. We live in an age when social media, mobile devices, the Internet, and other information technologies have virtually fused with our lifestyles. In discussing post-adoption behavior, focusing only on satisfaction might no longer be satisfactory. We should consider other constructs that might capture additional post-adoption factors, such as the concept of affect. In this study, we examined the influence of well-being on continuance intention and on loyalty. We compared well-being’s impact with that of satisfaction. A survey of 297 college students supplied the data that was entered into a structural equation model on social network site usage. The results showed strong support for satisfaction and well-being as influential factors for continuance intention and loyalty. Moreover, relative to satisfaction, we found well-being to have a greater impact on continuance intention and loyalty.