This chapter will provide an in-depth analysis of social networks with symbols, aiming to address the challenges of positive and negative relationships in the real world. First, this chapter describes the concept of positive–negative relationships and the structural balance theory. Then, it explores the practical application of the structural balance theory in the fields of daily life, business decision-making, and e-commerce environment. It also analyzes the balance theorem and the social status theory. At the same time, it briefly discusses the application of symbolic networks. Finally, this chapter explores social network community detection using the igraph tool to deepen the reader’s understanding of network structure.