BlackBerry makes BBM secrecy functions free

With privacy and secrecy functions a given in competing messaging systems, BlackBerry is dropping the subscription fee for users of the 'retract' and 'timer' functions of its cross-platform BBM messaging app.As BlackBerry's share of the smartphone market declined, it released versions of its BBM messaging app for iOS and Android to reach new users, but made some features available only as paid add-ons in a bid to shore up revenue.With some of those features now found at the heart of competing me