Using attachment and self-determination theory, this paper asserts that attachment style renders crucial innate needs for social connection amid individuals and a notable antecedent factor in social media inquiry. Thus, attachment style affects how individuals employ Facebook for social interaction to suffice their need for affinity and obtain psychological well-being. Outcomes from university and national samples displayed that individuals with high secure attachment gain satisfaction of the need for affinity and observe positive well-being, individuals with high attachment dodging do not employ Facebook for need satisfaction and observe negative well-being, and individuals with high fearful attachment get a sense of community through Facebook but still observe solitude. Indirect assays demonstrated that individuals with high secure and fearful attachment dimension lead to greater Facebook use, which offers a greater level of satisfaction of affinity needs and ends in more positive psychological results. Additionally, communication with good friends on both Facebook and offline portended higher well-being. These outcomes successfully related attachment theory to the self-determination process and expanded both theories into the social media area. This paper also offered a theoretical framework for future research to explore the link between Facebook use and well-being. After controlling for personality traits covering extraversion and self-esteem, attachment style still considerable affected psychological well-being, demonstraing that attachment style is a distinct factor in portending variances in well-being and farther displaying that innate affinity need is considerable when exploring the need satisfaction process in social media. Future directions are debated.