WordPress is best known as a blogging platform, but it can be a versatile piece of software as well, allowing you to turn it to almost anything you want. Here is how you can turn a WordPress installation into a in-house private Twitter-like microblogging system.
There is little or no coding required. What you need here is a custom theme and some plugins. There are currently two themes that can instantly turn your blog into a status update system: Prologue and P2.