My computer is my link to the outside world much of the time. I live in a very insular small town where nothing ever happens. I need the outlet. I also do a lot of creative things on it, and it helps to keep me sane. I have friends all over the world that I keep up with on here.
I have an older iPhone, and I admit it's always here next to me on my desk. I used to leave it home when I went out, especially with my sister because it's mainly her I keep in touch with on it. One day she said to me, "if something bad happens and we're separated, you need to have your phone," so now I take it with me wherever I go for safety reasons.