Version 1 of the REST API will cease functioning on SuperTweet API in advance of upcoming Twitter shutdown to ensure compliance

[Mr Blog]

Version 1 of the REST API is now deprecated, officially. The SuperTweet API will no longer support the Version 1 endpoints effective February 21, 2013. Please revise your apps and scripts to use the 1.1 endpoints

We are making this change on the Supertweet API in advance of the Twitter shutdown of the Version 1 API to ensure that the SuperTweet API app is in compliance and no longer making use of any Version 1 API endpoints when Twitter disables them in the coming weeks.

http://www.supertweet.net/about/api