This is when the company's founder is the main face, voice, and often the primary marketer. It's common in early-stage SaaS businesses.
In the early stages, you are the brand. A founder’s voice carries an authority that a generic company account never will. The challenge is finding the balance between being a "founder" and being a "marketer." You don't need to post all day; you just need to be clear about who you are and why you built this.