Facebook has updated its iPhone and iPod Touch app Facebook Messenger to version 1.7, primarily adding the ability to text friends for free using one's existing data plan. This extends the program's ability and enables messages to reach friends even if they don't have the Messenger app on their own device, either on the web or directly on their phone. The update also adds the iChat- and iMessage-like "typing indicator" that lets a user know when someone is replying.
