Now, ‘unsend’ a message using BlackBerry Messenger
“Message Retraction” lets you remove a message from the chat both before the other person can see it, and even after the message has been read.

Among them, though, is something everyone probably wishes they had — the ability to unsend a message. BlackBerry calls it “Message Retraction”, which lets you remove a message from the chat both before the other person can see it, and even after the message has been read.
BlackBerry does note, however, that this doesn’t mean people can't take a screenshot of the conversation.
BBM now also has a Snapchat-esque feature, called “Timed Messages”, which lets you set a time limit for your messages. BlackBerry says both apps will be free and unrestricted for the next three months. After that, the two features with other ‘premium’ features will be offered as part of a BBM subscription.
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