Bing search results showing up in Google
robots.txt applies to the source of the links, not the target.So if, say, http://www.paulgraham.com/ links to http://m.bing.com/search, then http://m.bing.com/robots.txt does not apply to that.EDIT: If you think this is wrong, please explain it instead of just downvoting me, because I think it is pretty unfair that I lose karma for explaining my interpretation.