"This new app is called Facebook Messenger and it allows you to talk to your Facebook friends for free on Facebook. Something like this was lacking, and this small app developed by Crisp App is welcome, but there is only a small group of people to welcome it - only those working on Mac and iOS. This app works only on a Mac computer, an iPhone, and iPod Touch and an iPad that runs iOS version 3.1.2 or later. A version for Windows is much awaited," writes Nadeem Unruth on About.com.
"Among many side features like a user-friendly interface, chat sessions management, multi-tasking support, photo handling etc., the app allows you to make free VoIP calls to any other person on Facebook that uses the same app," Unuth writes.
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Facebook Messenger - Free Voice Calls for Mac and iOS Users