Own a website? Google Downgrades Rankings for Non Mobile-Friendly Sites.

It hasn't been covered a lot, but as of April 21st 2015, Google change its search engine algorithms. One of the main impact is that now on, if your website is not mobile-friendly, it will be automatically downgraded and pushed away in Google search results.

So if your website relies heavily on Google search queries to get visitors, you will have to make sure it is fully responsive. If you notice lesser visits on your page starting today, that may be the reason why.

Read the Google webmaster article.
Also reported on Forbes.