[TeMPOraL]

That's WhatsApp, but I doubt it applies to Facebook Messenger.

[oxide]

I've always assumed my Facebook Messenger (and other private messages) were being monitored or otherwise datamined.

Corporate surveillance, with the intention of advertising to me no doubt, or selling what they can learn about me to advertisers.

I also assume any text messaging over Facebook Messenger can be used against me in a court of law. I don't imagine it's encrypted whatsoever.