Nintendo has released a web tool for use in the 3DS' internet browser, which allows the user to share screenshots from compatible games on Twitter and Tumblr. So far, only Animal Crossing: New Leaf
and Tomodachi Collection: New Life
work with the service – our friends at Engadget attempted to upload a picture taken with the 3DS' camera and were given an error about "incompatible software."
No indication from Nintendo that a westernized version of the utility is in the works, but the Japanese tool still works on this side of the globe, provided you can either read Japanese, or have a lot patience and spare time. Folks interested in investigating should point their 3DS browsers to i.nintendo.net.