Recently I developed a facebook application that can aggregate multiple twitter accounts’ tweets into a fan page on Facebook. The twitter accounts are placed into some predefined categories to display tweets in separate tabs in the application. Each tweet has the user information attached along with some social links of the respective user.
It has a strong backend that facilitates the management of twitter accounts, categories and their associations. Twitter feeds are retrieved using a CRON job in the server at a certain time interval.
You might be interested to check the application here: