Google has put out a new Wembaster Help video. In this one, Matt Cutts discusses responsive design and its impact (or lack thereof) on SEO. He takes on the question:
Does a site leveraging responsive design “lose” any SEO benefit compared to a more traditional m. site?
Cutts says, “Whenever you have a site that can work well for regular browsers on the desktop as well as mobile phones, there’s a couple completely valid ways to do it. One is called responsive design, and responsive design just means that the page works totally fine whether you access that URL with a desktop browser or whether you access that URL with a mobile browser. Things will rescale, you know, the page size will be taken into account, and everything works fine. Another way to do it is, depending on the user agent that’s coming, you could do a redirect so that a mobile phone – a mobile smartphone, for example – might get redirected to a mobile dot version of your page, and that’s totally fine as well.”