When Twitter switched off API 1.0 back on the 11th June, the tweets went dark for Choquk users as the application had not been updated in time to support API 1.1. This was due to the original developer Mehrdad Momeny not having time to maintain Choqok himself and on an appeal to the Linux community. Daniel Kreuter has stepped in and had developed Choqok 1.3.1 which supports the API 1.1.
For Debian users of KDE 4.10, a patch has been compiled and is available in Launchpad. Just download and run.