Facebook Launches its Audio-only Calling App 'CatchUp'

The internal R&D group of Facebook, the NPE (New Product Experimentation) Team, has come up with a calling application called Catch-Up.
This audio-only unique app has been developed to coordinate call timings with friends and family members and enables to set up group calls with up to 8 people.
CatchUp won’t need a Facebook account to use the service and the app works with your phone’s contacts list.
Through this app, user will get to know who all in their contact list are free to talk, and which contact is offline.
The CatchUp app has currently been launched in the United States for testing purpose.