According to Theo Heselman's tweet Google will start to test websites for their usability on mobile devices. The results will be used to calculate the ranking in the search results.
So let'ts take a quick test for yourself here: https://www.google.com/webmasters/tools/mobile-friendly/
I was lucky that this site has done well:
Author: Oliver Busse
http://about.me/oliverbusse
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