Think of all the ways you could tempt a phone user to visit a specific URL. An email, Twitter, a QR code, graffiti etc. This is just another one of those -- and

Think of all the ways you could tempt a phone user to visit a specific URL. An email, Twitter, a QR code, graffiti etc. This is just another one of those -- and not particularly easy to execute, at that. And if I wanted to carry a URL across borders or into a secure facility I would memorise a bitly link.