Re: Beware Pron ahead
It's Twitter's fault.
The privacy issue isn't important. Short URLs are irrelevant to that. The issue is similar to stupid phones that go to URL in a QR code without showing destination FIRST.
All short URLs are evil because you can't know what domain / website it goes to before you click. An intermediate page with simply the real link would maybe make short URLS acceptable.
ANYTHING that "sees" QR codes ought to prompt and not automatically "execute" them. Does QR use short URLS making that idea useless?