A growing number of users are now mobile-only if your website can't accommodate them you are losing potential clients. In April 2015 Google implemented one of its biggest changes yet to the search algorithm and its all about mobile. If you are not thinking mobile you could be hurting your Search rankings. Social media sites are not visited by more mobile devices than desktop computers. If you get traffic from social then you need to have a mobile ready website. With varying screen sizes from mobile devices, televisions, and a multitude of various devices accessing your website have a proper website design is becoming ever more important.
The shift is happening, mobile thinking is one of the most important consideration when its comes to doing business online.
Who is the target audience?
Anyone who wants to understand mobile web design
Mobile First Thinking
Benefits of Thinking Mobile First Future of Website Design