I'm not familiar with BBM , but it appears Kik works for Iphone, Android and Blackberry. The only significance I can see between using something like IM client

I'm not familiar with BBM , but it appears Kik works for Iphone, Android and Blackberry. The only significance I can see between using something like IM client, available on all these clients, is letting you know if message was read or not. Is there anything else, significant about BBM ?