If you are interested to share your BlackBerry messenger PIN, you can do it easily by just sharing your barcode without using your personal BlackBerry PIN.
How to do that? Follow these steps.
1. Go to BlackBerry Messenger, make sure your application is BBM 5.0
2. Inside the BlackBerry Messenger, scroll down to the bottom, or click 'Menu' button and get inside 'My Profile'.
3. Scroll down again and hit 'Display My Barcode'.
4. Go to menu and hit 'Save Barcode Image', then your BlackBerry will save the picture of your barcode into the gallery.
5. Connect your BlackBerry to computer, find your barcode image, then save it into your computer and upload it online.
It's your own risk.