RIM felt it important to release a KB for this:
A hoax message circulating on BlackBerry Messenger (BBM) asks users to forward on the BBM message to their contacts in order to maintain BBM service, and claims to have been originally sent by Research In Motion (RIM).
Rest assured that this BBM message did not originate from RIM and that it does not impact the security of BlackBerry smartphones. It is simply a hoax chain message. Unfortunately, many social networking applications face this scenario, whereby any message, including a hoax message, can be forwarded to a user from one of their contacts. We recommend that users simply ignore the message and do not forward it. Continue reading