The cross-strait research report released in 2022 shows that there are significant differences in the choice of social media among new media users across the Taiwan Strait. Although these media have a high degree of homogenization, there are also differences in functionality. It is precisely these differences that have led to differences in usage behavior among users of social software across the Taiwan Strait. The article compares WeChat and Line, which have the highest usage rates on both sides of the Taiwan Strait, analyzes the differences in user usage habits, and summarizes the development of social software on both sides of the Taiwan Strait and predicts future trends.