
Twitter Services provides Twitter support for Elgg plugins. To allow plugins to Tweet your content, you must first authorize your account in Twitter, and enable the plugins in the Elgg settings panel. These instructions are for network users. View this page for admin information.
(As of Oct 7 2010 only The Wire supports tweeting).
If the authorize link in the user settings page isn't working, there might be a configuration problem in the Twitter Services plugin. Contact your administrator and point him or her to the admin documentation.
If you have successfully authorized Twitter but nothing is being posted you might need to revoke authorization and then reauthorize.
If you are still unable to tweet, ask your administrator to make sure they selected "Read & Write" when creating the application.