Not bad, but my thinking regarding twitter is to think of it like it says it is, a micro-BLOGGING system. Your rules for twitter above hold fairly well to the rules for blogging. The big danger is that people forget each tweet is a blog post and start thinking their @ conversations are private IMs.
Totally agree. I think the difference is how the conversation take place. Twitter can at times almost be real time convo... where blogging rarely is (ie: I am just getting to your blog comment... but have seen you more on Twitter in the last 24hrs).
It's true that some people thing their @ convos are private IMs. I wish they would treat it more like a convo at a conference center. So much noise going on... you never know who is listening.
I think the person looking for a job was very creative and persistent. In the USA today if you want to get a chance to beat the 1000 other people looking for a job like yours you need to do whatever you can ( that's legal ) to try and get it.
But like you said stalkers can use it also. Everything in this world is a two edged sword.