Aaron does a walkthrough of BBM on Android.  Originally a BlackBerry (formerly known as RIM) exclusive, BlackBerry Messenger is now available through the Play Store and Apple's App Store.  For the most part, it looks like the version found on BlackBerry 10, and users are given a BBM PIN to use in addition to the other methods of adding friends.  The "Groups" option is present as well, so it's easy to categorize friends.  Have you used the app yet?  Give a shout and leave your PIN below!