Facebook Messenger vs iMessage


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Facebook Messenger
Facebook Messenger is an instant messaging service and software application which provides text and voice communication. Available now for Android and iPhone. Secure Facebook Messenger alternatives are Signal and Telegram. If you are looking for Facebook Messenger alternatives for business pay attention to GoToMeeting, Skype for Business.
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iMessage
iMessage lets you send messages back and forth with anyone on iPad, iPhone, iPod touch, or a Mac. If you’re a texter, you’ll love Messages on iPhone, iPad, and iPod touch. Now they all come with iMessage, a service that’s an even better kind of texting. Because it’s free for you and anyone texting over Wi-Fi using an iOS device or Mac with iMessage.
Face to face in the news:


2016 - Facebook Messenger adds group calls to keep up with iMessage


Facebook Messenger users now can start a group VoIP audio call from any group chat. Just tap the Phone icon, select which of the group chat members you want included and they’ll all receive a Messenger call simultaneously. If you miss the initial call but it’s still in progress, you can tap the Phone icon in the group chat to join the call. At any time you can see who’s on the call and send another ping to anyone who hasn’t joined. The maximum number of participants in a call - 50.