So there you are! We've got ourselves a fairly good URL shortener application. It's certainly not feature-rich or the most advanced, but it works and is ready to be expanded upon should you wish. Perhaps you could add user accounts or payment for advanced features?

It currently uses Twitter Bootstrap for the frontend so it probably could do with an individual face-lift, a different style, look and feel, but it's currently user-friendly and responsive to mobile devices.

In the next chapter, we will create a discussion forum, allowing someone to create a discussion and then letting people comment and reply.

A simple admin moderation system will be provided to help prevent any untoward shenanigans such as naked pictures of celebrities or signals intelligence being posted up, or something like that—unless of course you're into that sort of thing, in which case I hear that the Ecuadorian embassy in London do a terribly good lunch; you might get fed up of it after a few months, though!