Well, this seams both weird and disappointing to me. As a developer
there is NO CHANCE then to use shorted tumblr links found somewhere on
the internet for mashups and such.
Foursquare uses bitly for both shorting and expanding of the shorten
links. So you can use the bitly API to expand shorten links.
I'm not saying that you should move to bitly for link shorting. My
point is that it's absolutely standart for API vendors to also provide
the other way around (expand the links to be able the get the infos to
communicate with the API).
Does all this makes sense?
best
Aron