BlackBerry’s BBM service shocked the world when it finally went cross-platform last month. While many thought it would be dead on arrival, the app rocketed to No. 1 on the iPhone download charts and brought 20 million new users to the BBM platform within a week. BBM’s stunning success continued and in perhaps the most shocking of all early reports about BlackBerry’s new BBM efforts, the app’s engagement levels appear to be beating rivals. Downloads have slowed substantially since BBM debuted in October and the app is sinking fast, currently holding the No. 76 position on the top free iPhone app chart in the U.S. That position could soon get a boost, however, as BlackBerry makes its popular new BBM



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