We’re now starting to get a good idea of how much BlackBerry Messenger could be worth to BlackBerry. Now that WhatsApp has been bought for $16 billion and Viber has been bought for $900 million, we’ve got a basic floor and ceiling for BBM’s value, although the messaging service is probably much closer to Viber than it is to WhatsApp. That’s not a bad thing for BlackBerry, however — anonymous investor Quoth the Raven does some back-of-the-envelope calculations over at Seeking Alpha and concludes that BBM is likely worth around $2.5 billion right now. QTR is long BlackBerry, we should note, which gives him an obvious incentive to be bullish on whatever the company does. Nonetheless, his calculations strike us

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