What makes writing worth reading?

Hey my name is Joe, and I work in a button factory. The other day, the boss came up to me. He said, "Hi Joe, are you busy?". I said, "No". He said, "Push this button with your left hand".
Was this worth reading?
Was it worth the time to look over and process?
What makes writing worth reading?

I think that something that is worth reading is something that will be of interest to me. I love reading things that are funny. I also love reading things that will help me learn and become more knowledgeable in a certain area. Sometimes, I don't think that things on facebook are worth reading. In some cases, I do not need to know every place a person is going and what time they are going to bed.
After thinking about it more, I believe that anything that is written can be worth reading. Reading is an important to anyone and everyone. I think that even if you are reading something that is not important to you, it is important to the one that wrote it.