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Facebook seems to be acting on its plan to unify messaging, still slowly, across its apps. Users received prompts through the Instagram apps for Android and iOS saying they could “chat with friends who use Facebook” - that is, Messenger. The signature paper-airplane icon for DMs was replaced by the Messenger logo. You still can’t message Facebook friends, suggesting the announcement may have come early.
The update also brings a “more colorful” look to chats, and the option to reply to messages by swiping over them.