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Not sure if anyone here has seen one (first I've heard of it), but Google has emailed a friend of mine basically telling him that his site was a non-responsive site and that as a result it would do poorly in search results for searches performed from mobile devices.
Have you found any differences?
The SERPS don't appear to even take account of a "mobile friendly" site and one which is not. Have you found any differences?
Do you have to be signed in to get the "mobile-friendly" information?
Starting April 21, we will be expanding our use of mobile-friendliness as a ranking signal.
If you desktop site is running well in all type of browsers then Google will use your desktop signals for ranking your mobile website too.