BlackBerry shocked Wall Street on Thursday by delivering a much narrower loss than expected. The company is now growing its cash pile even though it is shipping fewer than 2 million phones per quarter. This stabilization is a feat in itself, but where is future sales growth going to come from? Messaging app system BBM is the best bet. It now has-close to 100 million active users-— but some decidedly worrisome trends have emerged-in recent months. Maybe the most alarming thing about BBM is that it seems to be losing its last toehold in affluent Western markets. BBM downloads tanked in the U.S.-after starting strong-last November. Recently, BBM has also slipped outside the top 50-on the iPhone download charts in



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