Not sure if WhatsApp has this feature, but I know Telegram does (and many said Telegram is a WhatsApp clone).
BBM should have this feature, I'm surprised that bbry hasn't implemented this already.
To have the ability to set a timer for how long the message is accessible, just like Glympse, would be awesome. And not just message via text but also voice notes and video.
Edit, looks like there's another thread in here regarding Telegram and security. Sorry