Digital design is an incredible field, it's continually evolving, no two days the same, influenced not just by trends and styles but by innovations in hardware, platforms and even the way we interact with each other.

Where once design was held back by dial-up, slow PC's and just not knowing what we could get away with, the world has opened up to limitless possibilities.

Here the Product Design Director of Facebook talks about how things have changed, what stays the same, and how to know good from bad in digital design.