This document summarizes a research study on the use of Twitter by the local government of Duisburg, Germany. The study analyzed all 792 tweets from the city's official Twitter account from May to October 2009. Key findings included: 1) Most tweets focused on local topics and events within Duisburg to promote a sense of locality. Common topics were local news and information about daily events. 2) The tweets helped create an online information network by cross-linking to other city media formats, increasing awareness of the city. However, interaction and participation through the tweets was limited. 3) While the number of followers grew steadily, Twitter remained a niche channel for the city. The tweets mirrored and reported local news