1. Want to express your disagreement with what I have written. If you want to do this then I will save us both some time. My response is: "I disagree".
2. Want to express your agreement with what I have written. If you want to do this then I will save us both some time. My response is: "I agree".
3. Get me to do something for you while acting as though it will benefit me. If you want to do this then I will save us both some time. My response is: "go away".
If none of those apply, you want to talk with me and you think you might actually have something to talk with me about then go a head and give it a shot.