Almost certainly, a time will come when a client asks for a list of Tweets to be displayed on their Drupal site.
There are a plethora of modules out there that can help provide this functionality. For example:
Mark Davies explains how to configure Microsoft Active Directory and Drupal's LDAP module for Enterprise integration with Drupal
Drupal has become a hugely popular framework for building big websites and is becoming more and more widely used in government and public sector. The likelihood of these organisations wanting to offer SSO to their users is pretty big also.