Facebook Messengers serviceFree
Is an instant messaging service and software application which provides text and voice communication. Integrated with Facebook's web-based Chat feature and built on the open MQTT protocol
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Nimbuzz Messenger Free
Nimbuzz Messenger is a free chat & calling app that helps you connect to your IM & Facebook friends.
WeChat is all-in-one communications app for text (SMS/MMS), voice & video calls, Moments, photos