We used to run our blog (but not our website) on WordPress, and if you know WordPress you know that there's an absolutely excellent WordPress plugin called Tweet Old Post that will randomly tweet out old posts for you.
Sadly, doing the same in Drupal is not such an easy feat. Frankly, given the prevalence of Drupal and the strength of the community, I'm very surprised that nobody's created a Drupal module to tweet old posts.
Over two days of searching, the best that I could find from the Drupal community on tweeting old posts in Drupal 7 were dead-end posts with suggestions like "you might take a look at the rules module". Now, if you're a Drupal superstar, maybe that's the way to go for you... but I wanted a much easier solution.
So, without further delay, here are the steps I used to automatically tweet random old posts from a Drupal blog:





