I wonder if this means Hacker News rankings will go down (considering it's almost impossible to read on a mobile device). That aside I think this is a great idea; the rank changes are limited to mobile search only and provide users with better results.
I'm only curious how they make the determination as to what site is or isn't mobile friendly. Is this programatic (I would have to assume it is) in which case how do they determine this? Some sites can make a good mobile site but they do it in an assbackwards fashion (e.g. using JavaScript only for resizing and reflowing); would those be counted? Does it require CSS device selectors or anything similar? I feel like it has to be a combination of things but would really like to know what.
I'm only curious how they make the determination as to what site is or isn't mobile friendly. Is this programatic (I would have to assume it is) in which case how do they determine this? Some sites can make a good mobile site but they do it in an assbackwards fashion (e.g. using JavaScript only for resizing and reflowing); would those be counted? Does it require CSS device selectors or anything similar? I feel like it has to be a combination of things but would really like to know what.