The service don't break it into tweets. It automaticaly create "that page" and add a link to it.
Now this is the "short answer", if it the person reading tour tweet also happen to have the extension, he don't need to leave the browser to see the "longer version".
You should definitely try it and see how practical it is.
No, they would have more debt because the credits AP credit provides are cheaper than the "premium" credits you'll now have to get through Dartmouth instead.
I think it used to happen only if your User-Agent parsed a few specific ways. I did just recently notice the broken "Copy Link Location" in places where it wasn't before.
It's essentially used by Google to see which search result you clicked on from the original query. Twitter does similar thing with t.co. It never used to happen on a non-logged in Google account, but now it does. It's been like that for at least half a year. The Greasemonkey script is a great work-around, especially if you value your privacy. Or alternatively why not try DuckDuckGo?
Yeah. Your friend who you suspect may be able to read your thoughts and predict your actions so you have to basically wipe your own memory each time you have a malicious thought.