The Internet it so vast place, but at the same time accessible to many/most people on this planet.
Writing helps me to focus my thoughts. Writing publicly on the Internet is supposed to focus these thoughts in a way that others, that can’t look into my own thoughts, can understand them, because I want to make myself better understood. The Internet is not only a place to file my inner world for later access, but for others to share their thoughts, on what I have compiled in written language. This is supposed to help me to understand my world, as I perceive it, better, and hopefully helps the readers and commenters to understand their own world better.