At a photography workshop, one of the older attendees introduced himself by way of a question: "What are the only two things needed by a photographer?"
In response, everyone immediately stated that more than two things were needed. Among those things were included camera, lens, film, print paper, darkroom, etc., etc. A lively debate soon arose. Film photography was in the early stages of being replaced by digital photography. Prints could be replaced by a transparency or digital projection but then a projector or monitor was needed. A pinhole camera did not have a lens. What was the definition of a camera?
Eventually, the questioner provided his own answer. He said that a camera was so self contained and inclusive that all a photographer really needed was a camera and an audience.
"And", he laughed, "the camera is optional!"
Perhaps all a photographer really needs is a blog.