It's 2013, the era of the cloud. But for whatever reason — it really doesn't matter why — BlackBerry's still stuck in a one-device frame of mind.

We live in a world of multiple screens. Some of us use more than one phone. More likely, however, is the combination of using a phone and a tablet. Being able to access your data anywhere is the crux of everything Google — and therefore Android — does. Apple's stumbled with iCloud, but damned if it's not trying. And for all its faults in the past, even Microsoft had this one figured out long ago with its "Three screens and the cloud" strategy

And then there's BlackBerry. BBM — BlackBerry Messenger — is finally available for iOS and Android. Sort of. You can download the app, then get on a waiting list, as BlackBerry's ramping things up slowly. But know this: You can only use one BBM ID on one device at a time. One ID, one phone. Or one tablet. 

And not at all (yet — it's coming) on a desktop or laptop computer.

Anyhoo. This isn't a surprise to anyone who's used BBM before. (Or the popular WhatsApp, for that matter.) But for those of us used to accessing our conversations on any connected device, it's a bit of a shock.

And it's really not how things work in 2013.