All new BBM registrations generate a unique ID known as the BBM PIN. This PIN is used to invite a person to chat on BBM. Hence, you don’t need to share your phone number / email in order to invite people. BBM does not reveal personal details about its users unless they opt to share it.
WhatsApp on the other hand uses phone number for registration. That means, in order to invite people to WhatsApp, you have to share your phone number with them, even if you don’t want to. WhatsApp also shares (by default) potentially sensitive user information like latest online time, contact details, etc.
When it comes to Group chats, WhatsApp often gets a lot of criticism. If any of your WhatsApp Contacts add you to a group having other unknown people, everyone in the group will immediately have access to your phone number, even if you don’t want to share it with them. If you don’t wish to join in a group on WhatsApp, you have to manually leave it; otherwise, you’ll keep receiving group messages – which could become really frustrating at times.
Thus, clearly, BBM has significant advantage over WhatsApp when it comes to user privacy.
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