| Unit | Example URL | Initially Implemented | Primary Use | Notes |
| Undergraduate Library | http://www.facebook.com/profile.php?id=1939902 | 2006 | external | |
| Undergraduate Library | http://www.facebook.com/group.php?gid=2212326596 | 2007 | external | |
| Undergraduate Library | http://uillinois.facebook.com/apps... | 2007 | external | The undergrad library has been devloping facebook apps for a while now, and is looking for a facebook app developer. Contact David Ward if you are interested! |
| Undergraduate Library | http://www.myspace.com/undergradlibrary | 2006 | external | |
| Interlibrary Loan | facebook (URL ?) | (?) | internal | Staff communications |