Yeah, this is so cool. Glad to see them taking this up.
But at the moment is seems to be a firehose feed of all their listings, really we want single user/shop feeds. Blogger is the closest analogy to this, it would be like a feed of all blogger posts but no option to subscribe to a single blog feed. but for sure we're gonna check out http://superfeedr.com/documentation#track in the mean time. keep doin' what you do Julien!
