It does.
I suppose a better description would be 'private messaging' if we want to compare directly with the huge numbers I see in court cases.
Not enough. We need to dig deeper than that. We need to define exactly what constitutes a "message"
For example, let's analyze this whatsapp conversation:
Husband (H): "yo, what's up?"
Wife (W): "nothing, just working"
W: "being bored"
W: "don't have much work on at the moment"
H: "OK, wanna come downstairs for a coffee?"
W: "Yes"
H: "OK, I'll put a pot up"
H: "Will shout when it's ready"
Are we counting this conversation as 8 messages?
Because that's how we, young people, message.
My parents' messages, instead, are basically digital letters, with separate paragraphs, various points/topics covered, and a series of questions...all in 1 message. That's how old people message.