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When it's detected that a mobile device is accessing the site it has the ability to redirect from www.example.com to m.example.com. Does it make more sense to employ a 301 or 302 redirect here? Google says a 301 but does not explain why (although usually I stick to "when in doubt, 301") . It seems like a 302 would prevent passing link juice to the mobile site and having mobile-optimized results also showing up in Google's index. What is the preference here?

My old logo did not fit well in the new Google+Local page and so I resized it and uploaded it a couple weeks ago using the Google Places admin tool. I have tried it on multiple locations but it does not show up on the actual Google+ page. The images do show up in the admin tool (so it wasn't that the logo didn't upload properly). I changed the description text to see if any changes were going through and those appeared after about 24 hours. Anyone been able to successfully upload new images to Google+Local?

Example: sitemap.example.com/sitemap.xml for pages on www.example.com.