This research is prepared to examine the existence of the companies and brands on social media networks. For this purpose, I collected data about the top companies and brands, and used bar charts to show their existence on the networks. Also, I examined the relationship between revenues, profits, and brand values of the companies and their social media followers by the help of Pearson correlation tests in SPSS. The results revealed that social media networks (especially, some popular ones) are significantly used by the companies for the purpose of marketing in general. However, the existence of the companies in social media changes from sector to sector. Especially, the companies in the sectors where the target is the individuals (B2C sector) and therefore, brand values are more important, the companies tend to exist in social media more frequently, also the social media users are more enthusiastic to follow their favorite brands, and companies in these sectors.