Exclusive First Look: SU.PR - Stumble Upon’s New Traffic Builder
http://www.fourhourworkweek.com/blog/2009/06/09/stumble-upon-supr/

suprtim”

Hello @twfeed. This @tferriss post & my comment in it explain why we need su.pr support in #TwitterFeed http://su.pr/2sT6ji [from http://twitter.com/GrowMap/statuses/5076485944]

Tim Ferriss, who worked on su.pr