In a phone conversation you are having an actual conversation. You can hear a human, the tone of the voice, hear if the other person responds immideately or hesitates. You get lots of contextual information you can't get from text alone.<p>And as the name implies a telephone conversation is an actual conversation. A conversation involves interaction.<p>With twitter you are not so much in a conversation as you yelling and hoping that gits on the internet will give you attention.<p>So yes, I'd say there is a difference and it lies in how the medium works, not in its implementation (i.e. digital or analog).