BlackBerry revealed via the official BBM Twitter account that in the first eight hours since launching BBM for iPhone and Android, the app has been downloaded over by over 5 million customers across both platforms. The app is also now the #1 free app on the iTunes App Store.

That number could actually be much higher, as the 5 million applies only to the number of users whose accounts have been activated for use. BlackBerry did not specify how many more users were still waiting to be activated, if any.