When a user replies to a message with a “thumbs up” or smiley face, for example, Facebook Messenger registers it as a reply, which is now an unread message.
So even a simple emoticon can create an unread message, triggering the unread message badge in the Facebook mobile app
When you switch over to the conversation in mobile, however, viewing that sentiment does not register as having read the message.
This causes the sentiment to remain in unread status, triggering the new message icon to recur again and again.
www.express.co.uk
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