The web has changed a lot over it's relatively short lifespan - it started off as a way of sharing ideas and opinions (along the lines of Geocities style personal pages), then it became about sharing media (think Flickr, Youtube and myspace) and now (in our humble opinion) it's about consuming content wherever you are and wherever you go. We expect to be able devour new information on our phones within seconds of unlocking it. Due to the ever increasing ways that users are accessing websites we need to realise something very important: the definition of "design" is changing.
Previously design, in the context of the web, referred to the layout and general style of a site, now though it seems to be more along the lines of "how can we present this information in the best way possible". These two ideas may seem very similar, and they are, but there is a subtle difference.