I wonder if there's a way that a messaging app such as Signal can be "integrated" with the Forum?
Signal is almost exactly the same as WhatsApp except not controlled by Facebook.
It has much better functionality for messaging anyway, the ability to back up messages (I think), end to end encryption, is free, can also support phone and video calls, and supports both p2p and group messaging. It would be much better to reduce the number of messaging apps one has to use, at the moment I have email (4 accounts), sms, WhatsApp, Signal, this forum, and a couple of other forums. People also sometimes send me messages on Instagram. Crazy!