BlackBerry's messaging platform had a strong first week on Android and iOS.

The company announced on Tuesday that 20 million new users have signed up for BlackBerry Messenger (BBM), bringing its total monthly active users to more than 80 million. According to BlackBerry, it defines monthly active users by those who "send or receive any data through the BBM service within a given 30-day period."

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It's important to note that while BlackBerry's announcement was tied to last week's launch of BBM on Android and iOS, the company didn't say that those 20 million users definitely came from Apple or Goog... [Read more]