https://techcrunch.com/2018/10/05/facebook-messenger-voice-control/

Facebook Messenger could soon let you user your voice to dictate and send messages, initiate voice calls, and create reminders. Messenger for Android’s code reveals a new M assistant button atop the message thread screen that activates listening for voice commands for those functionalities. Voice control could make Messenger simpler to use hands-free or while driving, more accessible for the vision or dexterity-impaired, and perhaps one day, easier for international users whose native languages are hard to type.

Facebook Messenger was previously spotted testing speech transcription as part of the Aloha voice assistant believed to be part of Facebook’s upcoming Portal video chat screen device. But voice commands in the M assistant are new, and demonstrate an evolution in Facebook’s strategy since its former head of Messenger David Marcus told me voice “is not something we’re actively working on right now” in September 2016 on stage at TechCrunch Disrupt.