Why Mobile Friendly Is No Longer A Web Design Option
In an era where wireless devices outnumber the human population, you should be concerned about the appearance of your website on tablets and smart phones.
According to Pew Internet, in 2012, 55% of mobile-phone owners went online and 17% of all mobile-phone owners went online exclusively via their phone. With the ongoing proliferation of browsers and devices that can access your content and e-commerce offerings, your website can be at a huge disadvantage if it isn’t optimized for mobile browsing.
The infograph below is a bit dated (2011). You should add about 7% to all projections stated.