BlackBerry released a new update for its iOS and Android BBM apps to integrate the new Find Friends features. BBM users on both platforms can now discover if their contacts are on BBM so they can send PIN invites. Aside from that, users can also send invites for non-BBM friends to download the app. The invite can be sent through SMS or email.
The feature will show up the first time you launch the app after updating and then it can be seen under the “invites” tab menu located at the bottom left hand corner of the app.
Source: The Next Web