Last week Google issued news that non-mobile friendly sites will not be looked upon as favorably as sites that have a mobile friendly tag.  The reason behind this is that Google is trying to provide a better place to perform searches on mobile devices such as tablets and smartphones. Mobile devices now account for over 30% of all search traffic. By promoting mobile enabled sites google is trying to provide a better web search environment.  To see if your site is mobile friendly, just use your Google Webmaster tools.