I know that we've been facing a lot of negative press to Blackberry, but I hope this lighten things up (unless if I'm not up to date XD)
While I was browsing the Viber site, found this.
Viber for Blackberry | Viber Support
I hope it arrives this month or April XD. I assume this is for the BB Smartphones. Though I wish they made one for the Playbook XD.