Less than a week old is a new social network for MINI owners called MOTORING CONNECTION. The website was started by Mark Vogler and can be found at motoringconnection.com.
The website lets your create a profile (with only one MINI, unfortunately), post photos and videos, create and join groups, add and respond to events, and view items for sale in the classifieds. There is a mobile version of the site, as well.
Edit: Library of Motoring has a profile there now. Friend us at motoringconnection.com/profile/libraryofmotoring.