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.
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