I saw a very interesting video of Michael Jackson filming himself in a mirror with one of the first handheld cameras. What was interesting about the video is that he's filming himself in the mirror and the first thing he says is "I'm not a narcissist." At the time, it was considered very narcissistic to film yourself, even for one of the world's biggest pop stars. When photos had limited distribution, their purpose was to remember what you had done in the past. Now, the purpose of photos is more to show off to others, so it's become the norm to include yourself in photos. I think it's fair to call this phenomenon self-centered in nature.